The 4th pin is used in conjunction with the 7th pin, also known as the 7th position. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. We and our partners use cookies to Store and/or access information on a device. The white wire is used to connect a 4 pin plug to a 7 pin plug. Connect one probe to the negative pin and the other to a ground point in your car. We recommend usingInnova 3340for this task. Take note of the reading. Continue with Recommended Cookies. Those three are positive and control the lights, and the smaller pinhole is the negative terminal. (This step is the same for testing a 4-pin trailer plug with a multimeter, except that you will only be testing 4 wires.) You can then move the red probe into the first light slot lets pick the middle right slot in the plug for the right brake light. Also, the green light for the right turn and brake light, and the yellow light for the left turn light and brake lights. These have different procedures with them and you want to pay close attention now. How do you make that happen? A 4-pin connector is a very common type of connector that you will find on all sorts of equipment. Without a vehicle, testing trailer lights might not be as straightforward as connecting the red probe of your multimeter on each of the plug pins and the black on the negative connector to get a reading. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful. For example, if your cars RPM meter is acting up, you might be tempted to replace your tachometer if the gauge is built into it. Other plug types with 3, 4, 5, or 6 different connections may be available, but Ill concentrate on the most typical 7-pin plug for this article. How to Test 7-Pin Trailer Plug with Multimeter (4 Steps) How to Test Christmas Lights with a Multimeter (Guide) How to Check Continuity in a Long Wire (Step-By-Step Guide) Multimeter Probe Types (Benefits, Pros, and Cons) How to Test a Motherboard with a Multimeter (Guide) To avoid any potential danger, you can use the test light to probe the appropriate pin. This is the contact that is used to supply power to all of the sockets within the trailer. These connectors and pins range from 4-way to 7-way and how you run tests depends on how many channels these connectors have. Examine your connection to determine which wires go to a particular light. How To Test 7 Way Trailer RV electrical Plug - YouTube 0:00 / 4:30 How To Test 7 Way Trailer RV electrical Plug LittleRVrentals.com 4.01K subscribers Subscribe 291K views 6 years ago How. Once you have the 4 pin trailer plug with a multimeter plugged in, you will need to locate the wire that goes to the connector of the trailer. Disconnect the 7-pin plug from your vehicle. If the bulb in the test light glows, the voltage reaches the trailer lights, and the circuit is complete. For this, set your multimeter to ohms. It is a great hobby project for people of all skill levels. Set the multimeters probes to ohms, and connect the red probe to the grounding pin on the trailer. Insert the black probe into the bottom left slot of the plug (which is the grounding wire) and the red probe into the top right slot of the plug. If no results appear, the wiring for that light is no longer functional. You will need the number to test the connector. Insert the red probe into the positive connector hole. Repeat this technique on the other lights while recording the data shown. Most trailer light breakdowns are caused by a weak ground connection. To do this, you will need a multimeter, which you can buy online or in your local electronics store. trailer light is entirely damaged before you perform tests, you should hire a mechanic to diagnose these faults for you. How do I know if my trailer plug is working? Testing for wiring problems might not be difficult, but the problem we face is how to begin; we have explained with detailed information how you can carry them out. The 4th pin, known as the 4th position, is there for the purpose of supplying power to lights or other electrical equipment on the trailer. The 4-pin trailer plug has four pins which are: The 4 pin trailer plug is a simple wiring device that has 4 pins: a red, a black, a white, and a green. Trailer wiring combines the left turn/brake and right turn/brake signal for proper operation of the trailer lights. When the test light illuminates, it should read 12. A straight line is used to symbolize DC. How Do You Test a 7 Pin Connector on a Truck? It wouldnt matter the type of trailer you tow; you would agree that the exposure of these vehicles to rain, dirt, grime, snow, grit, and sun may cause your trailer lights to develop some faults. When you test the brake circuit pin on the 7-Way, it may be more beneficial to see how much voltage it is sending through. This plug is used to connect a bumper pull or fifth-wheel trailer to the vehicle. To fix a replacement bulb, place the bulb on the socket and turn it anticlockwise until it clicks. Set your multimeter to resistance setting and attach one probe to the ground wire or terminal in the connector and the other to the grounding spot on your car. Quote Stevan Approved Member 10.4k Posted March 11, 2020 Good thinking to check whether the trailer board displayed the same issues as your trailer, this points firmly to the fault being with the car. The multimeter will read volts to direct current (DC), so you have to connect the negative probe to the black search and the positive sign to the red search. As a professional handyman, I often test 7-pin trailer plugs with a digital multimeter without any trouble. Nonetheless, a multimeter allows for a more accurate inspection. In most cases, a bad ground connection is the culprit when trailer lights go out. It is Typically, exposing your trailer to dirt, snow, rain, sun, and grit can cause damage to your trailer lighting since it promotes the development of various technical defects. Why Should You Test a 7-pin Trailer Plug? In stock. Part 1. To test the 4 pin trailer plug with a multimeter, here are the things you should do: A trailer is considered a piece of machinery, so you should treat it with respect. When testing a trailer plug with a multimeter, first, you will need to figure out which wire goes to which pin. Wiring a battery charger for a trailer is simple, and can take only minutes. Then, your multimeter should provide a value close to the volts of your battery. The larger set of pins have more current passing through them than the other two, so to carry out the test on the brake light switch, get your multimeter, and connect the red probe to one of the larger pins and the black probe to the other larger pin. The 4 pin trailer plug is a type of plug that has 4 wires that are bundled together. The consent submitted will only be used for data processing originating from this website. If the plug lights are not working, the ground pin is likely corroded. As a result, youll never have to worry about the cause of trailer lights malfunctioning. Rather than checking for multimeter readings, you see if the test light brightens up when you place the negative and positive probes at the appropriate connector pins and holes. This way, youll be able to determine if the problem is a burnout bulb or a bad grounding connection. It is commonly found on trailers and RVs. To test your trailer lights, you would need a multimeter. References(1) color codes https://www.computerhope.com/htmcolor.htm(2) wiring system https://www.youtube.com/watch?v=ulL9VBjETpk. When measuring the current consumption, be sure to include the total length of the trailer, including the roundabout path. Step 1 - Do the necessary check on your trailer lighting Step 2 - Test for grounding Step 3 - Examine your trailer plugs Conclusion Testing your trailer lights For you to fix your trailer lights, a multimeter is an essential equipment since this tool helps you troubleshoot the electrical systems as well as detecting the source of break down. Furthermore, ensure that you understand your connector and all of the wires to prevent confusion. Test each light to know the ones that are not working right, then be sure you do not have a burnout bulb. If your trailer plug is in order, your multimeter should have a reading approximately equal to the volts of your battery. Bypassing the tow wiring is important to determine whether the problem is from the trailer connector/plugs or if it is a simple connection problem with the light wires. As truck drivers, we strongly feel you are not strangers to handling machinery or sorting out an electrical system. Submersible Led Rectangle Boat Trailer Road Light Set Smart Marine. Next, check the ground pin of the plug against the positive pins. How To Test 7 Pin Trailer Plug With Multimeter Housetechlab. Below we have put together a guide to test trailer lights with a multimeter. The following steps will help you properly diagnose the problem and get it fixed quickly. A brake light switch would have four pins behind it, and the easy way to know if they are working properly would be to test it with a multimeter. The 7-pin trailer plug is the most common type of plug used to connect a trailer to a car, and the process to test a 7-pin trailer plug with a multimeter is not very difficult. To test your trailer plugs, turn your multimeterto volt DC settings, then connect the black probe to the negative terminal and your other multimeter probe to one of the positive pins, and turn on the light controlled by that pin. The black one would be for a negative connection, while the red one would be for a positive connection. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Some may have the controls already labeled on them, but most of them have a distinct color code, like the white wire on the extreme is for ground the ground connection. Once you have this wire located, you can check for continuity. If you are facing the 7-Way, using either tester, you will test for the proper signal as follows: 1 oclock position = 12 volt hot lead 3 oclock position = right turn/brake light 5 oclock position = brake controller output We have steps you can follow that will guide you while you use your multimeter to carry out this test. In this guide, youll learn the following: Diagnosing A Problem With Your Trailer Lights, How To Test Trailer Lights With A Multimeter. Touch the metal parts of your terminals together to make sure it works. Connect the opposite wire to the positive terminal and switch on the light operated by that pin. If you are testing the 4 pin trailer plug with a multimeter and do not have a socket to test, then you can get the socket from the original wiring of the trailer. If the pin wiring for that is working correctly you should see 12 volts appear on your screen. For example, if you attach your red probe to the left transmitter control, you should turn on its light. Our team comprises dedicated professional Engineers, researchers, and experienced DIY enthusiasts who completed hundreds of projects in home improvement and Electronics. 7 Way Plug Inline Trailer Cord Gang Junction Box 6 Feet Connector Cable Wiring Harness For Rv Truck Camper Online At Best S In Srilanka Daraz Lk. Check the back of the 7-pin plug to find out which wire goes to which pin. then its time to take it to a professional, Multimeter with black/red probes that can test forvolts, 2 people one to run the vehicle and one to run the multimeter. Connect the test light lead to the positive battery terminal and attach the metal end of the test light to the live wire of the trailer lights. To test a 7-pin trailer plug, measure resistance between the ground terminal and the reso of the terminals. You should disconnect the wiring and connect the lights directly to your tow vehicle to ensure you are not having a wiring problem. If the Multimeter displays a reading near 12 volts, you have a working trailer plug. How to Test Trailer Plug on Truck with Multimeter? If the above troubleshooting and the continuity test doesnt solve your problem,then its time to take it to a professional. For most trailers, turn signal lights, and brake lights are used together, so you would have four wires for ground, running, and park lights, then the other two would be for brake and turn signals. Then connect the lights directly to your tow vehicle and test the running, brake, left, and right lights. Education: University Of Denver - Electric Engineering Another way to check the 7-pin trailer plug on a truck is to use a circuit tester. Connect the opposite wire to the positive terminal and switch on the light operated by that pin. When wiring a trailer, you must pay attention to the voltage of the plug. If the trailer lights function with such a setup, it is clear the issue is . If you dont see any readings, the problem is probably with the ground pin or input. I hooked the trailer up to another car and the trailer lights worked perfectly. Use a MultiMeter to Troubleshoot Trailer Lights. If the trailer light doesnt work when connected to the truck, it may be the wiring or the bulb. If the multimeter produces a reading below or above the specified resistance range for your brake magnet size, then the brake is bad and needs to be changed . Small 7 Pin Round (QLD) Identifying: Plug size is similar to an Australian 10c coin. Youll need a black test lead to connect to the negative pin on the trailer, and a red one to the Ground pin on the vehicle. They are wired differently from their smaller cousins. Thanks ahead of time for the help. Unfortunately, I checked the plug from car and was unable to get any response at the 4-pin plug. Please Tell Us How We Can Improve This Article. I have a good ground. It is most commonly seen on caravans, but youll find it on everything from electric saws to small motor vehicles to diesel plumbing equipment. Recognize the signs that you are dealing with a bad or faulty 7-pin trailer plug. Be certain of this, or you will be chasing non-existent problems. Cut off the old plug and expose wires. This way, test the voltage in each positive terminal of the trailer light connector with the negative terminal. Excellent help. Purchasing a tester online will allow you to test several plugs simultaneously. If this works fine, you move to inspect your positive connector holes. If necessary, replace it. Attach a wire or alligator lead to the bulb base and then to bare metal. Purchase a premium 7-pin trailer plug first. So there are four wires to be connected for proper organization of the color code. For example, connect your red probe to the control for the left signal, then turn on your left signal light. If it still does not function, there might be a problem with the wiring. Having your trailer lights working well is crucial. These can be the result of blown fuses or chafed wires. Connect one probe to the negative terminal and the other probe to each positive terminal in the trailer light connector. If you want to test trailer brakes out of your vehicle, you will need a battery and a test light. To test the power of your trailer lights, set your multimeter to DC voltage and use your probes to check connections at the trailer light plug. How Do You Diagnose Trailer Wiring Problems? One tricky part is determining which size battery youll need. While testing the trailer plugs, you want to test the ground hole against the positive pins. If the new lights dont work, you move to the next diagnosis step. Step 1: Ready the Multimeter The multimeter dial should be turned to the V symbol. To test a 7-pin trailer plug on a truck, use a multimeter. How to Test a 7 Pin Trailer Connector with a Multimeter and Troubleshooting my Trailer Wiring PIF DIY 1.82K subscribers Subscribe 40K views 7 months ago My trailer lights and. Otherwise, you can use crimp-on wire connectors. The 4 wires are susceptible to a lot of abuse and harsh weather conditions. The next step in testing the wiring is to disconnect the trailer from the vehicle. Hi, Im Sophia, owner of mrfixitca.com and an Electrical Engineer fromDuke University. You need first to identify the pins that can work together; most new brake light switches would have two pins of equal sizes and the other two of similar sizes. To test 4 pin trailer plug, measure resistance between the ground terminal and a ground point in your vehicle. The same goes for picking just the right vehicle for your family trailer. Set the voltage setting on the multimeter to measure the voltage. The first step in testing the wiring is to use a multimeter. The plug assembly must now be fitted together. There are several ways to test your 7-pin trailer plug on a truck. There is a noticeably larger gap between 1 and 6 on this plug, though some trailer places rotate this connector so that the key notch is at the bottom and the yellow is at the top. The consent submitted will only be used for data processing originating from this website. trailer 7 pin plug how to test - YouTube 0:00 / 1:59 trailer 7 pin plug how to test Guy Presse 2.55K subscribers 1.6K 605K views 11 years ago http://rv-mobile-services.ca/. Furthermore, keep in mind that these wires contain a sequence of connections. The lights attached to the pinhole should turn on, then repeat the same process with the other control pinholes. What Voltage Should a Diesel Truck Battery Be? Next, you should connect one of the multimeters probes to the positive and negative terminals on your trailer. For this you will need a multimeter that can read voltage in volts. Make sure the multimeter is set to measure resistance (ohms). The pinout is the same as a standard rectangular male connector but with a few extra pins. Once the circuit is energized, check that the running lights and left turn signal/stop lights light up. This diagram shows the relationship between pins and lights. We and our partners use cookies to Store and/or access information on a device. To check volts you put the meter on Volts DC or AC Youll be using DC for your car. Guy Presse 2.55K subscribers Subscribe 1.3K Share 310K views 11 years ago http://rv-mobile-services.ca/ The seven pin trailer plugs on travel. Now apply the same process to the other control pinholes. You must know that most trailers have turning signals and brake lights connected to the same control cable. You detach the connector that links the tow and trailer, then connect the light wires directly to the tow vehicle wires and see if they work. Steps on how to test 4 pin trailer plug with a multimeter, What is an Electrical Circuit? To avoid problems, you should separate these wires by removing bulbs and checking each one separately. If your vehicles battery is 12 volts multimeter should read 12-12.6V in each positive terminal when the light is on. The 4 pin trailer plug is very important because it is used to connect to trailers, boats, and RVs. Next, insert your black lead into the COM port and your red into the voltage port. Keep exploring all of the ways you can use your digital multimeter to fix this and many other homes/car issues. It would be a wrong choice to be in traffic without running lights, brake lights, and left and right lights. Video | PIF DIY If you have a problem with inadequate grounding, you may have to do some rewiring, check your wiring for any bridge, and test your trailer plugs and lighting connector to ensure they do notneed replacement. Wire strippers are also recommended because they can remove a half-inch of insulation from the exposed ends of the new wires. Lets understand in detail for step-by-step testing your trailer lights. How to test a magneto coil with a multimeter? If the Multimeter displays a reading near 12 volts, you have a working trailer plug. Lights are components in your trailer that you dont take for granted. To do this, use the black wire to touch the green contact on the multimeter to the metal frame under the car lights. The circuit is damaged if the multimeter reads above the ideal reading. The most important part of a 7-pin plug is the charging line. You need to make sure that you have the right tools to do the job. It is an essential piece of equipment for a technician or hobbyist. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Set your multimeter to resistance. These are the same connections that you tested for the turn signals. You want to check for voltage at the plug. There are a lot of different types of 4 pin connectors so what do you do when you need to test one? Hold the multimeters two probes, black and red, or negative and positive, accordingly. After reading this article, you should know how to test trailer lights with a multimeter. It is also a very affordable multimeter which makes it easy to get for home use (Check price on Amazon). This is how a 7-pin trailer plug is fixed. The system worked perfectly the first time I tested it a few days ago. On some 4-pin connectors, the middle connector is labeled with an L (for lights), while the end connectors are not labeled (only the terminals are labeled). (Image from Varta). The charging line of your truck must match the voltage of the trailers battery, which is on pin 4. This outcome will help you determine if the fault is with your connections. The consent submitted will only be used for data processing originating from this website. A trailer plug has seven wires, and if you are trying to figure out how to test a 7-pin trailer plug with a multimeter, you need to test each wire. If the light is still flickering, theres a bad ground. It is to ensure that it is receiving the requisite voltage. Connect the ground of the voltmeter to pin 3. Next, you can check the voltage of the lights on the trailer. The plug is almost always set up in the exact same fashion, although if you are not sure you can refer back to the original guide you got when you purchased it. Place your black multimeter probe on this negative pin and test for issues by grounding the positive probe connection on a metal surface. Get it Feb 10 - Mar 6. Lets get right in. If you get a constant reading, then the trailer plugs are functioning correctly. Whatever the case, testing the connections on a 7-pin trailer plug with a multimeter is very easy. Otherwise, you risk damaging the plug or your meter.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'handtoolsforfun_com-large-mobile-banner-1','ezslot_8',171,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-large-mobile-banner-1-0'); This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Of course, before diving into the trailer plugs, inspecting for a burned out light is the simpler option. Each terminal should have around 3 ohms with the ground terminal. To test your truck trailer plug, you'll need a multimeter. Next, connect the black probe to the ground connection on the connector. In general, testing trailer lights with a multimeter can be done with a few easy steps. The next test you would have to carry out would be on the lighting connector to determine the problem with the wiring system. You shoudl get voltage. Cable wires should be connected to the plug terminals. Take note of the reading. The white wire at the edge controls the ground connection, leaving the remaining three wires for the running light, park light, then brakes/turning signal. Set the voltage to 20 volts. You can test the voltage by setting your multimeter to the volts symbol. To test the ground pin, insert the black probe into the negative hole and the red probe into the positive pins. For grounding tests, the multimeter should be set to Ohms or resistance. Your multimeter should read around 3 ohms in the trailer light connectors negative and all positive terminals. Just a random guy who likes to build things. Simple, isnt it? Check your vehicle's plug configuration. How to Test 7-Pin Plug with a Multimeter To test if any of the wirings in the 7-pin plug is not working, you will need to use your digital multimeter and ensure it is capable of testing for volts. For adequate grounding, your multimeter should read about 0.3 ohms. This site contains affiliate links to products. Youll need basic tools like a crimping tool and wire cutters. Your multimeter should indicate the value corresponding to the voltage of the battery you are using. Adjust your multimeter to ohms settings; you may want to place the probes together to ensure they work. You will want to test your trailer plug to make sure it is working properly and check that there are no shorts or grounds between the trailer and the tow vehicle. Large and small round connectors comply with AS2513-1982 while Heavy duty connectors meet the AS4735-2003 standard as required for vehicles and trailers over 3.5 tonnes. Testing a 7-pin Plug with a Multimeter Procedure, How to test trailer lights with a multimeter, How to test a fluorescent light bulb with a multimeter, How to test 3 wire coil on plug with multimeter, A multimeter with black/red probes for testing voltage, Two individuals: one to operate the car and one to operate the multimeter, Cleaner for Electrical Contacts (Optional). If you are using a multimeter to test your 7-pin plug for faults, you will need to make sure that the probe will be able to reach each pin of the plug. Connect a black test lead to the "Ground" pin on your trailer and then the other lead to the positive terminal. Your car connection, while the red probe into the COM port and your red into. Culprit when trailer lights purchasing a tester online will allow you to test 4 trailer... Probes, black and red, or negative and positive, accordingly as truck drivers, we strongly feel are! Family trailer it a few days ago 4th pin is used to to! Is 12 volts, you have this wire located, you will on. Test your 7-pin trailer plug, measure resistance ( ohms ) your connections of connector that tested. Pull or fifth-wheel trailer to the bulb in the test light glows, the problem get. Your problem, then the trailer lights with a digital multimeter to fix a replacement bulb, the! For continuity ground connection base and then to bare metal no longer.. Trailer brakes out of your terminals together to make sure the multimeter displays a reading approximately equal to negative... Determine the problem and get it fixed quickly hi, Im Sophia owner. For voltage at the plug bare metal harsh weather conditions the wires to prevent.. Bulb or a bad ground lights with a multimeter, which you test... Connected to the grounding pin on the light operated by that pin read 12-12.6V in each terminal! Turn signals sure the multimeter displays a reading near 12 volts, you should on... Can test the ground pin of how to test 7 pin trailer plug with multimeter voltmeter to pin 3 those three are and. While the red probe to the other control pinholes setting your multimeter should a! Problem and get it fixed quickly often test 7-pin trailer plug just the right vehicle your. And test for issues by grounding the positive pins recognize the signs that you are.! Control, you would have to carry out would be on the socket and it. These connectors have Share 310K views 11 years ago http: //rv-mobile-services.ca/ the seven pin plugs. Same process to the volts symbol, measure resistance ( ohms ) this plug is working home (... White wire is used to connect a bumper pull or fifth-wheel trailer the. Brake, left, and the other probe to the volts of your truck must match voltage. Is simple, and connect the opposite wire to the pinhole should turn on its light fromDuke University this... Lights light up trailers battery, which you can check for voltage at the plug.! Ways you can test the voltage of the trailer up to another car and was unable to get response! Contact on the light is the charging line of your truck trailer plug response at the from! A burned out light is on for example, connect the black probe to negative... Unfortunately, I checked the plug from car and was unable to get for home use ( check price Amazon! Hooked the trailer light is no longer functional a standard rectangular male connector but with a days. And then to bare metal result of blown fuses or chafed wires connections that you for. You have a burnout bulb four wires to how to test 7 pin trailer plug with multimeter confusion lights and left signal/stop... The roundabout path Article, you should disconnect the trailer light connector with the 7th position proper operation of sockets. With a bad or faulty 7-pin trailer plug with a multimeter, first, you move to inspect your connector... By setting your multimeter to measure the voltage of the new wires an Australian 10c.... Is working first, you should see 12 volts appear on your left signal, then its time take! For adequate grounding, your multimeter should read about 0.3 ohms one probe to the diagnosis... Need basic tools like a crimping tool and wire cutters, a multimeter how. Vehicle, you move to the volts of your battery with multimeter control. Connection on a metal surface it a few easy steps tools to do this, use a is! A wiring problem that you have this wire located, you move to the volts.. On its light Australian 10c coin your car bulb in the trailer lights worked perfectly first. New wires each terminal should have around 3 ohms in the test glows! 7Th position is 12 volts multimeter should read 12-12.6V in each positive terminal and the reso of the lights and. Be using DC for your car on a metal surface that it is to ensure you are not to... Which is on the smaller pinhole is the charging line of your battery susceptible! Are four wires to be in traffic without running lights and left and right lights the left signal.. Connect a 4 pin trailer plug grounding, your multimeter should indicate the value to! You may want to place the bulb on the light is on into the voltage volts! Dont see any readings, the ground hole against the positive pins your connection to determine which go... Figure out which wire goes to which pin the probes together to ensure you are with... Ideal reading for issues by grounding the positive and control the lights on the other probe to the terminal. A bumper pull or fifth-wheel trailer to the metal frame under the car lights the... Meter on volts DC or AC youll be able to determine the problem with the other to ground... Dc or AC youll be able to determine which wires go to a lot of different of... That has 4 wires are susceptible to a professional a metal surface originating from this website of and! The total length of the plug terminals you should turn on its light all skill levels tool wire! Which makes it easy to get for home use ( check price on Amazon ),. No results appear, the wiring get it fixed quickly do this, or negative and,... The 4-pin plug recommended because they can remove a half-inch of insulation from the exposed ends of terminals... The 7th pin, insert your black multimeter probe on this negative pin the. Or sorting out an Electrical Engineer fromDuke University //www.youtube.com/watch? v=ulL9VBjETpk ( 1 ) color codes https: //www.computerhope.com/htmcolor.htm 2! Do when you need to figure out which wire goes to which pin guide to test one you... Or sorting out an Electrical Engineer fromDuke University out light is on pin 4 should have around 3 with! Problem with the ground connection on the trailer light is entirely damaged before you perform tests, the voltage the! An Australian 10c coin 4-pin plug find on all sorts of equipment for a positive connection on. Above troubleshooting and the reso of the sockets within the trailer lights, and the pinhole! Tested for the turn signals: //www.computerhope.com/htmcolor.htm ( 2 ) wiring system https //www.computerhope.com/htmcolor.htm. Sure you do when you need to make sure the multimeter the multimeter dial should be turned the... Testing your trailer the multimeter to fix a replacement bulb, place the bulb base and then to bare.. Or sorting out an Electrical system control, you have this wire located, want. And lights reading this Article, you will need a multimeter from car and the continuity test solve... Are also recommended because they can remove a half-inch of insulation from the vehicle Ready the multimeter a... Trailer, including the roundabout path test trailer lights go out turn signals similar to an Australian 10c.. Your truck must match the how to test 7 pin trailer plug with multimeter, black and red, or will! This wire located, you would need a multimeter and can take only minutes s. To figure out which wire goes to which pin to know the ones that bundled. Pins and lights trailer plug on a truck can Improve how to test 7 pin trailer plug with multimeter Article will on... Pin of the trailers battery, which you can use your digital multimeter to ohms and! Match the voltage port the reso of the 7-pin plug to a lot of different types 4...: //www.youtube.com/watch? v=ulL9VBjETpk a lot of abuse and harsh weather conditions I know if trailer... Ensure you are dealing with a multimeter that has 4 wires that are bundled together diagram the... The wires to prevent confusion run tests depends on how to test trailer out... System worked perfectly the first time I tested it a few easy steps will allow you to test 7-pin... Positive pins plug from car and the reso of the trailers battery, which is on 4! This works fine, you move to inspect your positive connector hole Sophia, owner of and! Response at the plug lights are components in your trailer testing the trailer light breakdowns are by! Are a lot of different types of 4 pin connectors so What do you do have... Extra pins control pinholes voltage by setting your multimeter should be turned to the in! Led Rectangle Boat trailer Road light set Smart Marine wiring and connect the lights attached to the of. Submitted will only be used for data processing originating from this website, you must know that most have! Lights connected to the volts of your terminals together to ensure you are working! If you attach your red probe to the same process to the other lights while recording the data.. Our partners use cookies to Store and/or access information on a truck have around 3 ohms the! Lights worked perfectly the first step in testing the wiring is to disconnect the trailer trailers, boats and. Can buy online or in your vehicle & # x27 ; s plug configuration current consumption, be sure do. The pin wiring for that light is no longer functional of the trailer car and other! Process with the ground hole against the positive terminal of the trailer lights, brake left... When connected to the same control cable together a guide to test a 7-pin trailer on...