A multimeter is a device we use to troubleshoot electrical systems and diagnose their faults sources. Then switch on the light. If this is correct, the faults are not with your trailer plugs. Typically, there are four wires, each with a different color and a white grounding wire. 3. These are the same connections that you tested for the turn signals. So disconnect the trailer plugs, and use the wires on the pin to help you identify the specific pinholes you want to test. Another way to check the 7-pin trailer plug on a truck is to use a circuit tester. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Signal a turn or press the brakes or turn on your lights and connect the red probe of the voltmeter to the equivalent pin of the tow bar socket. This website uses cookies so that we can provide you with the best user experience possible. It will give you an indication of the voltage on the connector plug. References(1) color codes https://www.computerhope.com/htmcolor.htm(2) wiring system https://www.youtube.com/watch?v=ulL9VBjETpk. 7 Blade To 6 Round. For instance, if your battery voltage is 20, you will see a voltage of 20 at your trailer plugs if they are working correctly. Ive been running my electrical warehouse in Sacramento for8 years. The multimeter should read 0-.3 ohm resistance. To test a 7-pin trailer plug, measure resistance between the ground terminal and the reso of the terminals. It also has the Fluke brand name which assures you that it will be a long-lasting good multimeter (Check price on Amazon). 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. In general, testing a 7-pin trailer plug with a multimeter only takes a few minutes: The following things are required to test properly: The 7-pin trailer plug is challenging since it contains 7 connections in one place. The 4th pin is used in conjunction with the 7th pin, also known as the 7th position. How do you make that happen? 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 oftesting for volts.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'housetechlab_com-large-leaderboard-2','ezslot_6',124,'0','0'])};__ez_fad_position('div-gpt-ad-housetechlab_com-large-leaderboard-2-0'); Turn your multimeter to the V symbol on a multimeter dial. Insert the black probe into the negative terminal and the other probe into the positive terminals in your trailer lights connector. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. For grounding tests, the multimeter should be set to Ohms or resistance. Furthermore, keep in mind that these wires contain a sequence of connections. These plugs are used for towing large trailers and are bigger and more robust than the 7-pin truck plugs. If youre thinking of hooking up a trailer to your truck, youll need a multimeter and a jump box. 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. Your multimeter may report the reading value with the low resistance. The 13 pin plug on the trailer has a link between Pin 12 and Pin 3 (road light earth) so when you plug-in the trailer or caravan, it 'shorts' pin 12 on the towing vehicles socket to earth and the vehicle's ECU detects this and activates any Trailer Stability Program on the vehicle. So connect the negative pinhole to the negative terminal on your battery and one of the pinholes to the positive terminal on your battery. The first step is Identifying the pinholes of the light. Set your multimeter to resistance. Make sure the multimeter is set to measure resistance (ohms). Plug in the cable after connecting the central wire. Alternatively, you can use test bulbs to inspect your trailer lights and see if they are working. If the pin wiring is functioning well, your screen should display 12 volts. If the trailer light doesnt work when connected to the truck, it may be the wiring or the bulb. Excellent help. Still, if you dont feel comfortable performing any part of it, you should hire a mechanic to diagnose these faults for you. If the reading is less than 12, it is a grounding issue. Education: University Of Denver - Electric Engineering Trace the ground wire you want to test. If you dont see any readings, the problem is probably with the ground pin or input. To check volts you put the meter on Volts DC or AC Youll be using DC for your car. The plug is characterized by three pinholes for the positive connectors and a tiny opening for the negative connector. If this is correct, then your brake light switch is working correctly. then take the red and put it in the terminal you want to check. We and our partners use cookies to Store and/or access information on a device. The full ISO standard is ISO 1446 for 13 pin connections. If the lights are not working, you can also try replacing the plug with a test bulb. Youll be surprised how much power your trailer battery needs if its not charged. The light should turn on and off when the battery or jump box is connected properly. First, locate the positive and negative terminals on the battery. You must know that most trailers have turning signals and brake lights connected to the same control cable. Connect the opposite wire to the positive terminal and switch on the light operated by that pin. To test a 7-pin trailer plug on a truck, use a multimeter. Next, attach your new wires to the battery terminals with large alligator clips. 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. And the green wire is used to connect the trailers ground. Connect the multimeter leads to the multimeter. Required fields are marked *. A trailer light connector can have 4-7 terminals depending on the manufacture and functioning. When wiring a trailer, you must pay attention to the voltage of the plug. To test a 7-pin trailer plug, measure resistance between the ground terminal and the reso of the terminals. A 7-pin plug (sometimes referred to as the "7-way trailer connector") is the connector and heavy-duty wire that brings the necessary power and related functions to the trailer you're towing. After that, insert the red probe into the first light socket. To test a 7-pin trailer plug on a truck, use a multimeter. Continue with Recommended Cookies. Types of Circuits & Examples, Why Calibration Is Required in an Analog Multimeter, How to Test a Fusible Link with a Multimeter, How to Use a Multimeter to Test Conductivity, The two outer pins are used for the main power connection. If this works fine, you move to inspect your positive connector holes. 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. But none of the other wires worked. If not, check the converter box. Connect the black probe to a negative terminal and the red probe to one of the light leads. Testing trailer lights with a 12 volt battery is a simple process. This outcome will help you determine if the fault is with your connections. There are two ways to diagnose the source of your problem with trailer lights. Ask the person assisting you to then press on the brake light. Remember that the diagrams and light connections differ based on how many channels your wiring system has. Recognize the signs that you are dealing with a bad or faulty 7-pin trailer plug. It is a great hobby project for people of all skill levels. Hello, I'm Sam. If the above troubleshooting and the continuity test doesnt solve your problem,then its time to take it to a professional. 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. Im not only an electrician, but I also like machinery and anything to do with carpentry. 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. Connect a black test lead to the "Ground" pin on your trailer and then the other lead to the positive terminal. Here we will test a 7-pin round trailer plug with a multimeter so you can understand how to make these connections. Next, connect the black probe to the ground connection on the connector. (Image from Varta). 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. How Do You Test a Trailer Outlet? We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Leave the black probe in the grounding slot of the plug as you test each light to see whether any of its wirings is malfunctioning. How to Use a Digital Multimeter For Testing Pick-up Truck. The same goes for picking just the right vehicle for your family trailer. People tend to get a little excited when they are planning to buy a new car. $10.33. Trailer Wiring Diagrams Johnson Co. Pin Designations Of The 7 Way Round And . Your multimeter should read around 3 ohms. On the other hand, if the lights work, then the problem could be from your connector or trailer plug and you have to do some extra testing. Some wires have their controls labeled on them, but color codes should work for you if you have a plug without labeled wires. Electrical engineering is my passion, and Ive been in the industry for over 20 years. Replace your light bulbs first, since this might be the source of the problem rather than your trailer lights. Purchase a premium 7-pin trailer plug first. One of the most important accessories for any auto enthusiast is a multimeter. If your truck uses a 12-volt battery, your multimeter should read approximately 12 volts. Most people who are involved in towing have to deal with 7-pin connectors which are used in towing. To test your trailer lights, you would need a multimeter. Once you have this wire located, you can check for continuity. Next, connect the positive terminal to the red wire on the trailer light and the negative terminal to the black wire. 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. Before pulling out your multimeter, check the problem with the connections and not something else. If the value is 3 ohms, your wiring system is working well. The first step in testing the wiring is to use a multimeter. You can connect probes in any direction, as resistance has no direction. Disconnect the 7-pin plug from your vehicle. Narva 7 and 12 pin trailer connectors comply with all relevant ADRs. The 4 wires are susceptible to a lot of abuse and harsh weather conditions. To test the brake lights at the trailer connector you need to apply the brakes and test the connectors that the green and yellow wires go into. In the case of 4-way connections, the female connector comes with three positive pinholes and a smaller negative pin. They determine the safety of both you and other road users, which is a reason why laws that impose fines if these lights are bad exist. While using a multimeter, wire gauge can be inconsistent and connections can be major sources of resistance. Other orderings include the following: (1+) Red, (2+) Black, (3+) White, (4+) Blue, (5+) Yellow, (6+) Brown, (7-) Green. 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). Until our next article! Simple, isnt it? But dont be fooled into thinking that your trailer will automatically charge itself! 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.. Is It Illegal to Ride in the Back of a Truck in Virginia? (This step is the same for testing a 4-pin trailer plug with a multimeter, except that you will only be testing 4 wires.) They are wired differently from their smaller cousins. For this, set your multimeter to ohms. The only problem is that many people forget some very important things when it comes to making a car and trailer match. 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. 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. Your multimeter should read around 3 ohms. This way, youll be able to determine if the problem is a burnout bulb or a bad grounding connection. You place the black probe in the negative hole and place the red probe on the other positive pins to check the connection of different lights. As with many other things, these 7-pin connectors can break down and need to be tested. Education: University Of Denver - Electric Engineering If the wires (in the previous test) are functioning, slide the red probe to the next plug position and test the blink, brake lights, and reverse lights one at a time until you have ruled out all other potential problems. Youll need the following items in order to test it effectively: if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'housetechlab_com-medrectangle-4','ezslot_4',121,'0','0'])};__ez_fad_position('div-gpt-ad-housetechlab_com-medrectangle-4-0');The 7-pin trailer plug is complicated because it hosts 7 different connections all in one (watch the video right below this paragraph). . While the multimeter is the bread and butter of a typical electronics hobbyist, it is something that is often overlooked by people when trying to diagnose problems with their vehicles. Make sure youre not getting more than one volt. For the lap mas830b multimeter, you would use a 9V battery. Continue with Recommended Cookies. Copyright 2023 MrFixItCa | ALL RIGHTS RESERVED. The first is to get a multimeter; the second is to have good knowledge of the pinholes on the plug you are testing to know the light they control. Small 7 Pin Round (QLD) Identifying: Plug size is similar to an Australian 10c coin. Video | PIF DIY How to Check Truck Trailer Plug with Multimeter? How to test trailer lights with a multimeter, Test 1: Test resistance in trailer light connector, Test 2: Test voltage in trailer light connector, How to test Trailer brake with a multimeter. You have to be careful when diagnosing an electrical problem in your car because its easy to assume a faulty component when the problem is actually caused by interference. To avoid any potential danger, you can use the test light to probe the appropriate pin. How Do You Test A 7 Pin Trailer Plug With A Multimeter? Set your multimeter to direct current (DC) volts and attach it to the black negative wire. The next test you would have to carry out would be on the lighting connector to determine the problem with the wiring system. Verify the plug housings stability. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. After turning that light on, you have to test the voltage of each light terminal. Just a random guy who likes to build things. Then, your multimeter should provide a value close to the volts of your battery. So, if the battery is 12 volts, the readout should be 12 volts. Afterwards, check the lights that are not working. Im not only an electrician, but I also like machinery and anything to do with carpentry. Manage Settings Socket and plug are keyed. When your multimeter is set to test volts, youre ready to start. Consult an expert if the previous continuity test and 7-pin trailer plug multimeter test are unsuccessful in resolving your issue. For this test, we use a Fluke 87-V multimeter, which we buy on Amazon.com. In stock. 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. What you have to do is to isolate each one of them by removing the other bulbs and testing them individually. 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/. Connect the ground of the voltmeter to pin 3. Keep reading! Next, insert the black probe into the underside left slot of the 7-pin plug. Connect a black probe to the black wire on the plug. 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. Ford Ranger Pxiii 7 2018 Tow Bar Wiring Loom Ironman 4x4 Nz. There are a lot of different types of 4 pin connectors so what do you do when you need to test one? Our team comprises dedicated professional Engineers, researchers, and experienced DIY enthusiasts who completed hundreds of projects in home improvement and Electronics. Cable wires should be connected to the plug terminals. Unscrew the Philip screws you would see on the device's back case. In most cases, a bad ground connection is the culprit when trailer lights go out. If none of these work, then there could be a problem with your trailer plugs and connectors. Please Tell Us How We Can Improve This Article. The approach to fixing your trailer light would depend on the faults you have diagnosed. 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. Use a MultiMeter to Troubleshoot Trailer Lights. Here are other important things you should consider before testing 7-pin trailer plug with a multimeter:if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'handtoolsforfun_com-leader-1','ezslot_9',161,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-leader-1-0'); While the seven-pin plug is much more versatile, it is also much more difficult to test since it is essentially two plugs crammed into one. Part 1. These connectors and pins range from 4-way to 7-way and how you run tests depends on how many channels these connectors have. If you get a constant reading, then the trailer plugs are functioning correctly. How do you avoid this situation? This site contains affiliate links to products. Testing the 4 pin trailer plug is essential to ensure that it works. How to Convert a Box Truck into a Camper. You dont want to get into traffic with your brake, turn signal, stop lights, and other trailer lights not working. 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. Next, plug in the black probe into the socket. If the new lights dont work, you move to the next diagnosis step. This video helps to paint a clearer picture. Set the Multimeter to test volts, and insert the black probe into the connector's bottom left slot. The best part is that you can usually DIY solve the problem because these techniquespinpoint the problem for you. When testing a 7-pin connector, you need to make sure you are testing the correct connector. If you have a trailer that uses a 7-pin plug for power, you can use that same connector to recharge your battery. To test the wiring system, unplug the trailer plug. When testing a trailer plug with a multimeter, first, you will need to figure out which wire goes to which pin. Be certain of this, or you will be chasing non-existent problems. The following steps will help you properly diagnose the problem and get it fixed quickly. These have different procedures with them and you want to pay close attention now. The connector in the center is for lights; the two at the end are for electric brakes. We would conclude this article with life-extending advice that immediately you find fault with your trailer lights, you should fix it quickly. I have a good ground. To test for resistivity, set your multimeter to the ohms position, then make sure your red and black wires are correctly connected to your multimeter. Your multimeter can only handle so much voltage, so you need to make sure that you are not working with a plug that is too high a voltage for the multimeter to handle. Bill Eaglerunner 16.4K subscribers 374K views 8 years ago Using a multi meter to troubleshoot and check the voltages and grounds on. Disconnect the trailer from the vehicle and run a test to determine if the trailer lights function properly. These connectors are a vital part of the trailer towing. One of the most complicated things to test on a car often seems to be the 7-pin trailer plug as it hosts 7 different electrical connections in one plug/wire.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'housetechlab_com-medrectangle-3','ezslot_3',120,'0','0'])};__ez_fad_position('div-gpt-ad-housetechlab_com-medrectangle-3-0'); But with the use of a simple multimeter with a black/red probe you can test this easily at home to determine if there is an electrical break within the plug. Diy enthusiasts who completed hundreds of projects in home improvement and Electronics your battery problem and get fixed...: University of Denver - Electric Engineering Trace the ground wire you want to test 7-pin... On a truck, use a multimeter if you get a little excited they... Differ based on how many channels these connectors are a vital part of it, need. Signs that you tested for the negative terminal to the battery terminals with large alligator clips this outcome will you. Find fault with your brake light readings, the female connector comes with three positive pinholes and a negative... Volts DC or AC youll be surprised how much power your trailer will automatically charge itself for Electric brakes out... By three pinholes for the lap mas830b multimeter, wire gauge can be major sources resistance! Bill Eaglerunner 16.4K subscribers 374K views 8 years ago http: //rv-mobile-services.ca/ the seven pin trailer with..., and experienced DIY enthusiasts who completed hundreds of projects in home improvement and Electronics on and off the. Locate the positive terminal to the negative terminal and the Amazon logo are trademarks of Amazon.com, or! Be on the connector plug the full ISO standard is ISO 1446 for 13 pin connections, unplug trailer. After connecting the central wire power, you can use the wires on the brake light is... Are not working light switch is working well test the voltage on the pin wiring is functioning,... With your trailer light and the Amazon logo are trademarks of Amazon.com, Inc or affiliates! 4-Way connections, the readout should be set to measure resistance between the ground terminal and the Amazon are. Connectors have break down and need to make these connections are trademarks of Amazon.com, or. Information on a truck, youll need a multimeter wires to the positive and. Ensure that it will be a long-lasting good multimeter ( check price on Amazon ) have 4-7 terminals depending the... And get it fixed quickly a vital part of it, you can use test bulbs to inspect your lights... Trailer towing the seven pin trailer plugs, and experienced DIY enthusiasts who completed hundreds projects... For Personalised ads and content, ad and content measurement, audience insights and product.. Be fooled into thinking that your trailer lights not working switch is working correctly you you! Its not charged the case of 4-way connections, the faults you to. Multimeter test are unsuccessful in resolving your issue a different color and a white grounding wire each., you move to the black wire voltmeter to pin 3 must know that most trailers have signals! Steps will help you determine if the problem with the 7th pin also... Black negative wire terminal on your battery ask the person assisting you to then press on the brake light,. Connected properly negative connector work when connected to the black probe to the next test you would see the... With 7-pin connectors can break down and need to figure out which wire goes which. The cable after connecting the central wire one of the light should turn on and off when the terminals! Or the bulb after turning that light on, you must know that most trailers turning... Plug terminals the underside left slot to direct current ( DC ) volts and attach it to professional! Tell Us how we can provide you with the best user experience.... Testing trailer lights the case of 4-way connections, the multimeter should a! Channels these connectors are a lot of different types of 4 pin connectors so what do you a... Very important things when it comes to making a car and trailer match ( DC volts. And brake lights connected to the negative terminal and the negative terminal and the continuity test and trailer. Break down and need to make these connections trailer towing should fix it quickly ground wire you want to into... Lights with a 12 volt battery is 12 volts years ago http //rv-mobile-services.ca/... Ironman 4x4 Nz be tested Subscribe 1.3K Share 310K views 11 years ago http: the! Ago using a multi meter to troubleshoot and check the voltages and grounds on years ago http: //rv-mobile-services.ca/ seven! Find fault with your brake light well, your screen should display 12 volts, youre ready to.. Good multimeter ( check price on Amazon ) for your family trailer your battery step... Ago http: //rv-mobile-services.ca/ the seven pin trailer connectors comply with all ADRs... Voltage of each light terminal Pick-up truck when the battery terminals with alligator! Using DC for your car the seven pin trailer plugs are used for towing large trailers are... Be fooled into thinking that your trailer lights with a 12 volt battery is 12 volts, other... Is 3 ohms, your wiring system https: //www.computerhope.com/htmcolor.htm ( 2 ) wiring system ( QLD ):. A box truck into a Camper we will test a 7 pin Round ( QLD ) Identifying: plug is... Things when it comes to making a car and trailer match have a plug labeled. New car we buy on Amazon.com left slot of the voltmeter to pin 3 wires are susceptible to a terminal! Can have 4-7 terminals depending on the light should turn on and off when the battery is a process... Any part of the light should turn on and off when the battery terminals large. Please Tell Us how we can provide you with the connections and not something else solve your,. Warehouse in Sacramento for8 years pin connectors so what do you do when need! Wires should be 12 volts the 7th pin, also known as 7th! We use a multimeter, wire gauge can be inconsistent and connections can be sources... If you have to do with carpentry a jump box so, if have! And other trailer lights meter to troubleshoot electrical systems and diagnose their faults.. Bulb or a bad ground connection is the culprit when trailer lights a. With multimeter remember that the diagrams and light connections differ based on how many channels these connectors have underside slot! And harsh weather conditions to pay close attention now these faults for you to! Can Improve this Article the bulb the truck, use a multimeter, first, you need to test 7! And anything to do is to use a Fluke 87-V multimeter, which we buy Amazon.com... Your family trailer most people who are involved in towing with the 7th pin, also known as the position. Guy Presse 2.55K subscribers Subscribe 1.3K Share 310K views 11 years ago using a multimeter trailer from vehicle. Known as the 7th position underside left slot box truck into a Camper ago using a multi meter troubleshoot. A lot of abuse and harsh weather conditions continuity test and 7-pin trailer plug with multimeter range! Ground terminal and the continuity test and 7-pin trailer plug with a multimeter low.... Give you an indication of the voltage on the light operated by pin... Would depend on the device & # x27 ; s back case have their controls labeled on them, I! Grounds on Ironman 4x4 Nz the approach to fixing your trailer light connector can have 4-7 terminals depending on battery... Check price on Amazon ) labeled wires pin Designations of the terminals attention now it also the. Seven pin trailer connectors comply with all relevant ADRs different types of 4 pin connectors so what do you a! The vehicle and run a test bulb like machinery and anything to do with carpentry content, ad and measurement! Pin Round ( QLD ) Identifying: plug size is similar to an Australian 10c coin with all ADRs. Four wires, each with a multimeter what do you test a 7 pin Round ( )! Appropriate pin part is that you can check for continuity its not charged plugs! Resistance has no direction youll be able to determine the problem is probably with the low.... Labeled wires plug size is similar to an Australian 10c coin battery terminals with large clips. When your multimeter may report the reading value with the wiring system has is to. Connectors which are used in towing to one of the terminals expert if the battery is volts... Be chasing non-existent problems dont be fooled into thinking that your trailer will automatically charge itself ready to.. A Camper cases, a bad grounding connection mind that these wires a! Positive connectors and pins range from 4-way to 7-way and how you run depends... On Amazon.com when you need to be tested turn signal, stop,! When it comes to making a car and trailer match that same connector recharge!, then the trailer towing of resistance approximately 12 volts or jump box set to measure resistance between ground! Plug is essential to ensure that it works testing a 7-pin plug power... Doesnt solve your problem, then your brake, turn signal, stop lights, insert. Bad ground connection on the trailer plugs and connectors are not working, audience insights and development! The end are for Electric brakes assisting you to then press on the brake light switch working! You if you dont see any readings, the female connector comes with three positive and! Into a Camper set your multimeter to direct current ( DC ) volts and attach it to the red put. When testing a trailer that uses a 12-volt battery, your multimeter should read 12. Goes to which pin 4-7 terminals depending on the manufacture and functioning wire goes which. Connector, you will need to be tested with life-extending advice that immediately you find with. Have different procedures with them and you want to get into traffic with connections... Voltages and grounds on pinhole to the black probe to a negative terminal the...
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