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Expert Answers about Wiring


  • How to Convert a 4-Way Connector to a 5-Way with Separate Taillight Circuits
  • It sounds like you have a trailer with separate tail lights from the brake light circuit and you are looking to convert the 4-way from your motorcycle to a 5-way. First thing you will need to do is convert your combined tail light circuits to a separate tail light circuit. So like you said you would need another converter box. You would want a Converter Box # 118158 to make that conversion. You will also want to get a Hopkins Endurance 5-Way Flat Trailer Wiring Kit # HM47890 to give...
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  • How to Find the Reverse Light Wire on a 2008 Cadillac DTS
  • I have some information that will help you locate the reverse light wire on your 2008 Cadillac DTS, but GM has been known to use different color wires from time to time for the tail light and backup light circuits. This is because the plant can run out of a particular wire color from time to time and instead of halting production to resupply, a different color wire is used to complete the vehicle. I did some research and I have found various responses to this question from a blue wire...
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  • Wiring the Pollak Metal 7-Pole # PK12703 by Function to a Vehicle When Wire Colors Dont Match
  • When you wire up the Pollak Metal 7-Pole # PK12703 you will want to wire it by function and not by color necessarily. The red wire you referred is for the left stop/turn circuit. Your truck may not have this color wire for this function so you would need to use a circuit tester like part # 3808 to determine which wire on your vehicle is for that circuit and then wire it to this connector. Use the diagram I attached as a guide.
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  • Troubleshooting Trailer Taillights that Stop Working When Head Lights are Turned On
  • It sounds like you have a bad ground connection. If all ground connections are not making good contact to bare metal, when the tail lights are turned on then the trailer lights will go out or not function properly. You will need to check all of the ground connections especially where the tail lights are mounted to the trailer frame, and where the light brackets are mounted if they are bolted to the frame. If a plastic license plate holder is mounted between the left side taillight and...
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  • Running Light Circuit on Factory Trailer Connector Not Working on a 2010 Ford F-150
  • Your 2010 Ford F-150 does use fuses for the tow package wiring. It could also have relays related to the tow package wiring. Use the vehicle owners manual to find the locations to check them. It does sound like a fuse or relay problem. To check a relay the easiest way is to use a known good relay in place of a potential bad one. The other possibility is that there is a break on the running light wire somewhere between the front of the truck and the connector at the back. You can use...
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  • Adapter to Mate 6-Way Square Trailer Connector to 4-Pole Flat Vehicle Connector
  • First, thank you for including the photo of your pop-up trailer's connector. Photos always helps us help you. You are correct that Hidden Hitch Jayco adapter # 30104 will let you connect a 4-pole flat connector to a 6-way square connector on a Jayco brand trailer but your Dutchmen 801D may not be wired with the same pin configuration. You can try this part and it might indeed work, and if it does not you could cut it and re-wire the two sides to the appropriate set up using butt connectors. Or,...
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  • Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
  • It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side trailer connector using a circuit tester such as # 3808. Turn the vehicle headlights on and use the circuit tester to test the pins on the connector at the back. If there is no power on the running light pin then there is a break or loose...
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  • How to Determine the Functions of the Wires on a 6-Way Round Trailer Side Connector
  • To determine the wire functions on the trailer side 6-Way connector you have a couple of options. First, you can trace each wire back on the trailer to see where they go. Depending on how the wiring is routed on the trailer this could be easy or difficult. The other possibility is to use a separate 12 volt battery and touch each wire to the positive terminal and see what lights up or powers on. On a 6-Way round trailer side connector if looking at the end that plugs into the vehicle...
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  • Protecting a Trailer Side 7-Way Connector from Corrosion
  • There isn't a cover for a trailer side 7-way connector. But what you can do is use some dielectric grease, # LT37534, to repel moisture and protect the contacts inside the connector.
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  • How to Complete the Reverse Light Circuit of a 7-Way Trailer Connector
  • Sounds like something Uhaul would do. Just kidding, there is a large group of people who don't end up using the reverse light circuit of their trailer wiring so I could see them not completing that circuit when they did your install. They should have asked you though. What you are going to need to do is first determine which wire of your vehicle taillight wiring carries voltage when the reverse lights are applied. To do this you will need to use a circuit tester like the part # 3808...
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  • How to Charge a Camper Trailer's Battery While Being Towed
  • To put a maintenance charge on your trailer's battery you are going to need to have a 7-way installed on both the 2010 Wrangler and your trailer. The 12 volt circuit of 7-way can put a maintenance charge on a trailer's battery if the circuit is ran to the positive post of the battery. In your situation this is the most common way people charge the battery. You should note that this method will only put a maintenance charge on the battery and would not charge a depleted battery. It sounds...
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  • Trailer Running Lights Do Not Work when Connected to Ford F-150
  • Your Ford F-150 might have relays related to the tow package wiring and not just fuses. Use the owners manual to find the locations of any relays (or fuses) related to the tow package wiring. The easiest way to see if a relay is bad is to use a known good one in place of a potential bad one. If all fuses and relays are good then the problem is somewhere between the trailer connector at the back of the truck and where it terminates at the front. You can use a circuit tester such as...
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  • Troubleshooting Trailer Connectors That Do Not Pass Running Lights or Turn Signals
  • The best way to troubleshoot trailer wiring is to first test your Acadia's 4-pole WITHOUT the Curt adapter. This will let you know if the signals are reaching the adapter. Even though the LED test lights may come on, since these take so little power to light up it could be that there is a small residual voltage in the system that is causing them to illuminate even when no actual running light or turn signal is reaching the adapter. You can use a tester like the # 40376 to check the Acadia's...
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  • Adaption a 7-Way Blade Style Connector to a 6-Way Square Connector on a Trailer
  • Using multiple adapters just increases the chance that something could go wrong. The best solution is to use an adapter to go from a 7-Way blade style to the 6-Pole square. To do that though an adapter would have to be fabricated. All you will need is a trailer side 7-Way, # H20042, and a vehicle side 6-Way square. For the 6-Way square you would need # 37995 but only use the vehicle end to wire to the wires on the 7-Way, # H20042. On the 7-Way the wire functions are: White = ground Red...
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  • LED Trailer Lights Not Working when Towed by 2007 Mercedes ML350
  • Since one of your trailers has LED lights and you are towing with a 2007 Mercedes ML350 I recommend using adapter # TR20141. It will work with trailers that have regular incandescent lights too. This adapter has built in load resistors that simulate more power draw from the trailer lights so that trailers with LED lights will not confuse the tow package wiring system on your Mercedes. In some cases, the load resistors in the adapter are not enough. In those cases additional load...
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  • 7-Way Recommendation for the Rear of Trailer for Attaching Second Trailer
  • Sounds like you are towing two trailers that both have trailer brakes. As long as the brake output circuit is completed from one trailer to the next the part # C57674 would work to send the amperage to each trailer. You will want to be sure that each trailer has 10 gauge wire for the brake output circuit like part # 10-1-1 (sold by the foot). The blue wire of this adapter would need to get run to the output of a brake controller that is designed to handle the amount of brake assemblies...
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  • How to Tap Into Reverse Light Circuit of a 2011 Ford Ranger When Installing a 7-Way
  • The purple wire of the Adapter part # 37185 that you referenced is the reverse light circuit and would need to get run to the reverse light circuit of your 2011 Ford Ranger. You will need to use a circuit tester like part # 3808 to test all of the wires running to the taillights of your vehicle until you find the one that carries 12 volts when the vehicle is in reverse. There should only be two wires run to the reverse light socket so it should be easy to determine which one to use. You...
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  • Troubleshooting Running Light Circuit Not Functioning After Curt Harness # 56200 Install
  • It sounds like you have one of two things going wrong on your trailer wiring setup. Either you aren't using the correct circuits when you wired up the Curt Harness part # 56200, or the trailer you are towing has weak grounds and can't handle the load of every circuit being activated. First check to make sure that all of the connections you made on your tow vehicle to install the # 56200 are made to the correct circuits. Specifically the red wire of the converter with the brown stripe....
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  • New Electric Trailer Brakes Not Working After Installation on 5th Wheel Trailer
  • It is possible that the wire gauge used on the trailer is not large enough to handle the current required by the new brakes. We recommend using 10 gauge wire such as # 10-1-1 in these situations. Also, make sure that the magnets on the brakes are grounded to clean and corrosion free bare metal surfaces near the magnets. You may also need to have the drums inspected to see if they need to be turned or replaced. If any grease got inside the drum or on the shoe pads then that would negatively...
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  • Will Curt Wiring Harness # 56146KIT Work in 2014 VW Jetta Sportwagen TDI
  • The Curt wiring harness you referenced, part # 56146KIT, will work fine on your 2014 Volkswagen Jetta TDI SportWagen. This harness offers slightly higher current output capability than the similar Tow Ready # 119179KIT. I have linked an install video showing the Curt harness being installed in a 2010 Volkswagen Jetta SportWagen. The linked article will also be helpful to your installation by providing tips for routing the harness power wire.
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  • Trailer Right Turn Signal Not Working on Multiple Trailers Towed be the Same Truck
  • It sounds like there is a tow package fuse or relay that has blown. Use the vehicle owners manual to find all of the fuse/relay locations related to the tow package wiring to check them. Checking fuses is easy enough but for a relay the only way to really check for a bad one is to use a known good one in place of a potential bad one.
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  • Troubleshooting 7-Way Installation that Has No Right Turn or Stop Lights on Trailer
  • It sounds like you may have a loose wiring connection or a corrosion problem on the 7-way pin for the right turn/brake lights. This pin is the one at the 3-o-clock position as you're looking at the vehicle's 7-way; please refer to the linked photo. Check that the (usually green) wire that runs to this pin is securely affixed to the 7-way and check its insulation for any signs of wear marks or cracks that could be causing an intermittent short, especially at spots where it may rub against...
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  • Trailer Wiring Harness Recommendations for 2014 Audi Allroad
  • Your best bet would be to use a universal harness like part # 119190KIT. Installation would involve looking at the table listed in Step 1 of the instructions (see link) and determining which of the 6 possibilities matches the taillight system on your Audi. You'll need a circuit tester like part # 40376 to probe the wires in the taillight wiring harnesses to determine which wires carry which signal. Once you determine which possibility matches your vehicle, wire the harness according to...
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  • How to Determine the Functions of the Pins on a Vehicle Side 7-Way Trailer Connector
  • The Pollak circuit tester # PK12741 will tell you which functions are working in a 7-Way trailer connector but it doesn't tell you the location of the functions within the connector. But I can tell you that. If you are looking at the face of a vehicle side 7-Way where you would connect the trailer: 1 o'clock position is 12 volt power 3 o'clock is right turn and brake lights 5 o'clock is output to trailer brakes 7 o'clock is ground 9 o'clock is left turn and brake lights 11 o'clock...
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  • How to Determine the Wire Functions for a 7-Way Trailer Connector on a 2003 Chevy Silverado
  • I have included a picture showing how a vehicle side 7-Way trailer connector is wired. The colors may not match up to what is on your 2003 Chevy Silverado though. This is in part because vehicle manufacturers can use whatever color they want for any given function since there is no standard. If you do not already have a 7-Way connector that the wires are attached to you will have to use a circuit tester such as # 3808 to determine the wire functions.
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  • Replacement 7 Way Connector for Use with 10 Gauge Wiring
  • The Bargman 7-Way Connector, # 54-77-003, can be used to replace your current connector which has 2-10 gauge wires. When connecting the 10 gauge wires, as well as the other wires, you can use a ring terminal like part # DW05705-1 if you prefer.
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  • Install of Tekonsha Prodigy P2 Brake Controller and 7-Way Trailer Connector on 2012 Chevy Silverado
  • You can certainly use your Tekonsha Prodigy P2, part # 90885 in your 2012 Silverado. The 2012 Silverado tow package wiring doesn't need the # 3015-P plug you mentioned. The tow package wiring terminates in blunt cut wires under the dash, with no connector needed. You could wire a # 20127 pigtail connector onto the tow package wires, which would allow you to swap the controller between vehicles. You could also use a # 7686 pocket mount on both vehicles, which would once again allow you to...
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  • How Do You Take Apart Pollak 5-Way Round Trailer Connectors to Attach Wires
  • To take apart the Pollak 5-Pole vehicle side connector # PK11502 or its matching trailer side connector, # PK11501, you would remove the set screw and then the pin portion will either fall out or you will need to push it out from the back of the connector using a screwdriver.
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  • No Trailer Running Lights, Brown Wire Causing Short on a 2007 Suzuki Forenza
  • The brown wire on wiring harness # 119178KIT or # C56175 for your 2007 Suzuki Forenza is for the running lights so if it is not connected then that would be why the running lights are not working on the trailer. So the question now is why does connecting the brown wire cause a short? There could be more than one wire that carries a running light circuit. Make sure to test the wires with the included circuit tester to figure out which wire(s) carry the running light circuit on your vehicle. You...
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  • Why are there So Many Different Trailer Connectors and Ways to Wire Them
  • If you think we have it bad here in the states try going to Europe where they have a 7-Way that does the same things as our 4-Way and some kind of 13-Way to do what our 7-Way does! In the US the biggest issue is the 2 different ways that a 6-Way round connector can be wired. The center pin will either be for electric brakes or 12 volt power. Usually when the brakes immediately lock up it is because the 12 volt circuit on the vehicle connector or adapter is wired one way and the one on...
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  • How to Determine Wire Functions on a Tandem Axle Dump Trailer
  • Trailers in the US have combined turn signals and brake lights on the same circuit. So it is likely that the yellow wire is left turn/brake lights, green is right turn/brake lights and brown is running lights. That leaves black and red. One of them is the ground, likely black, and the other is for another function, possibly 12 volt power or for an electric reverse lockout if the trailer has hydraulic brakes. The easiest way to determine wire function would be to run power using a separate...
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  • Plug and Play Four Way Wiring Harness for 2003 Lexus GX 470
  • We may have a plug and play wiring harness that will give you a 4 way and 7 way on your 2003 Lexus GX 470. The harness you use will depend on how your 3-pin plug on your Lexus is wired. Lexus wired some of their 2003 Lexus GX 470's differently for some reason. Use a circuit tester like # 3808, and holding the socket on the vehicle so that the retaining clip is at the bottom, use the tester on the right hand pin. If you get power on that pin (you might need to turn on the ignition),...
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  • Installing Converted 4-Pole/7-Way on RV With Unconverted 6-pole Square Trailer Connector
  • You'll need a taillight converter to combine the right turn, left turn and brake lamp signals into two circuits (right turn/brake and left turn/brake) for the trailer. First, I'd remove the existing 6 pin square connector on the RV, as it's an obsolete connector. Use the taillight converter, part # 119147KIT, and install its inputs color for color to the RV harness where you cut off the 6-pin connector. Yellow converter wire to yellow wire on harness, green to green, brown to brown,...
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  • Trailer Wiring Has 5-Wires White, Yellow, Green, and 2 Browns
  • If it was a 4-pin connector with 5 wires then it is called a wishbone harness and would have 2 wires attached to the running light pin so you have one wire for each side of the trailer. Typically, on a 4-Way, the white wire is ground, brown is running lights, yellow is left turn/brake lights, and green is right turn and brake lights. On a wishbone 4-Way you would have a ground wire and then you usually see a brown wire with yellow stripe for the left side running lights and a brown wire...
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  • Troubleshooting Tail Lights on Trailer Only Work When Running Lights Are Turned Off
  • I tend to think it's a ground issue or potential short on your vehicle side wiring. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector ground should be attached to clean and corrosion free bare metal surfaces. Also, I would check the grounds for each of your tail lights. If the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the...
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  • Troubleshooting 7-Way to 12 Volt Power Outlet Adapter for a 2010 Ford F-150 Platinum Supercrew
  • I recommend using a circuit tester like # 40376 and test the 12-volt pin, located in the 1-o'clock position on your 7-way connector. Also, check the bottom pin which is the ground circuit. I would also check your vehicle fuse panel and make sure that there are not any damaged fuses that could be causing this problem. The wiring in the adapter # PK11896 wasn't designed to be altered. I included a informative article about wiring for you to look at.
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  • Troubleshooting Tekonsha Brake Controller Installation that Shows Trailer Not Connected
  • You can test the brake circuit output at your truck's trailer socket by using your volt meter on the appropriate pin while you have a helper press the manual override. Press the controller's manual override with the power/boost settings at maximum. You should detect close to 12 volts on the truck's brake circuit. If you don't check the vehicle wiring for wear spots or cracks in the insulation that could be causing a short. You can also test the trailer brakes directly by bypassing the...
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  • 7-Way to 4-Way Adapter Recommendation for a 2011 Mercedes ML350
  • Yes, the adapter part # HM47365 would work well for you based on your description of what you have. It sounds like you have a 7-way connector at the back of your 2011 Mercedes ML350 and a 4-way connector on your trailer. This adapter would convert the 7-way to a 4-way and would work well for you. The 4-way connector is still a very widely used connector for trailer wiring. It most often used on trailers without brakes, whereas the 7-way is used on trailers with brakes. If your trailer...
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  • Replacement 7-Way Recommendation for a 2006 Chevy Trailblazer
  • For a replacement 7-way for your 2006 Chevy Trailblazer you would want the Tow Ready 7-way part # 20119. This also has a 4-way built into the side of it. You would just need to remove the harness from the back of your current 7-way and then plug it into the round connector of this harness. For a replacement 7-way for your trailer you would want the part # H20043. Since trailer wiring colors can vary from vehicle to vehicle your best option would be to use a jumper cable from a car battery...
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  • How to Adapt 4-Pole Trailer Wiring for Connection to Truck with a 7-Way Trailer Connector
  • No worries, we can help you! If your trailer still has a 4-pole plug like the one shown in the linked photo then you may be able to use a simple adapter like # PK12716 or # HM47065 to connect your trailer to your truck's 7-way. If you have just the wire leads then you can make a more reliable permanent modification to the trailer so it matches your truck's connector without the potential reliability issues that can occur when using adapters and the extra connections they create....
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  • How to Determine Trailer Wiring Functions on a Travel Trailer for 7-Way Replacement
  • Trailer wiring color codes can vary greatly so I have a solution for you, but I can't tell you which color wire goes where on your trailer for wiring up a new 7-way. However, you may look around the wiring junction box or pin box of your trailer. There may be a diagram there. Instead you will want to use a jumper wire from a 12 volt source like a vehicle battery to apply voltage to all of the wires of your trailer wiring to see what activates. It can help to use masking tape to label...
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  • Are the Pins of a 7-Way Trailer Socket Supposed to be Bent
  • If the pins of your current 7-way are bent down and do not look like the pins in the 7-way picture that I attached you would need to either bend them back so that they make contact again or replace the entire socket with something like the part # PK12703 that you referenced. Your bent posts are the reason your trailer wiring is working properly.
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  • Trailer Wiring Recommendation for a 2012 Audi Q5
  • The Curt wiring harness part # 56200 that you referenced has been confirmed as a fit for your 2012 Audi Q5. It sounds like your problem has to be in the way the converter box is wired. You will want to use a circuit tester like our part # 3808 to verify that all of the connections you made to install the harness were to the correct circuits. I attached a video that details how this process was done on a similar vehicle. The wire colors will be different, but the testing process will...
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  • What Trailer Wiring Connectors are Often Found on Rental Trailers
  • A 7-way trailer wiring harness is a very commonly used trailer connector that most trailers are designed to work with. The only other common wiring connector that you might encounter would be a 4-way. Which all you would need then to convert your 7-way to a 4-way would be the # PK12716. With the # PK12716 you would have the ability to tow a trailer with either a 7-way or a 4-way which would cover basically any trailer you would be able to rent.
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  • Trailer Brake Lights Not Working when Connected to a 2003 Chevy Suburban
  • This is a strange issue because at the trailer connector the brake lights and turn signals are on the same circuit. What I recommend is to test the vehicle side trailer connector with a circuit tester such as # 3808 while someone sits in the Suburban and presses the brake pedal. If there is no power on the brake light/turn signal pins then the issue is likely a blown fuse on the vehicle. Use the owners manual to find the location of the stop light fuse and any fuse related to the tow...
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  • Trailer Connector Adapter to Tow Trailer with LED Lights with a 2009 Mercedes GL450
  • The adapters you mentioned, # TR20141 and # C57003 can be used on any vehicle. The bulb out sensor issue arises mostly on German vehicles like Mercedes, BMW, VW, and Audi. So despite it putting emphasis on VW, Porsche, and Audi they can be used for any vehicle including your 2009 Mercedes GL450.
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  • Troubleshooting Trailer Brake Lights Not Functioning
  • The first thing I would check would be the left/brake and right/brake circuits of the trailer connector that is on your vehicle. You will want to use a multimeter like our part # BTMT15 to test for voltage when the brakes are applied. If there is voltage there with the brakes applied then you know the problem lies in the trailer wiring, and it most likely is that there is a ground problem on the trailer wiring. You will want to check the wiring of your trailer for loose wiring, corrosion...
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  • Does Every Wire of the Adapter 4 Pole to 7 Pole # 30717 Have to Be Run
  • The yellow wire of the 7-way adapter part # 30717 is an aux. circuit that typically gets used for reverse lights. If you have no use for that circuit you would not have to hook it up. You could then just tape it up and out of the way.
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  • Trailer Hitch and Wiring Harness for a 2016 Kia Sorento
  • For a 2016 Kia Sorento you can use Curt wiring harness # C56151. Curt does have this harness listed for all models of the 2016 Kia Sorento. If you also need a trailer hitch I recommend Draw-Tite hitch # 75908. This is a Class III hitch with a 2 inch receiver rated for 500 pounds tongue weight and 5,000 pounds gross trailer weight. I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise...
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  • Recommended Wiring Harness for 2014 Volkswagen Passat
  • We do have a recommended wiring harness for your Passat. You will want trailer wiring harness # 119190KIT. If you were planning on towing a small trailer with your Curt hitch (you might also need the following to complete your towing system: Ball mount # C45521 Pin and clip # PC2 2 inch trailer ball # 19258 1-7/8 inch trailer ball # 19256 I have included an installation video of this hitch for you to check out too.
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  • Does 4-Way Trailer Wiring Harness have to be Routed Out of the Truck on a 2010 Mercury Grand Marquis
  • The manufacturer of trailer wiring harness # 119179KIT recommends routing the 4-Way from the trunk, closing the lid on it. If there is a grommet or you don't mind drilling a whole if not grommet is available you can certainly do that and we have recommended it before. Both methods are viable when done properly.
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  • Need Wiring and 5 Way Connector for 26 FT Boat Trailer with Surge Brakes
  • When it comes to replacing the wiring on your boat trailer with surge brakes, I recommend using our 40 FT Wishbone 5-Way Trailer Harness with 30" Ground and 5 ft. Blue Wire, # A40W5B. I have included a short video for you. If by chance your tow vehicle is equipped with a 7-way connector, now would be a great time to make the change on the trailer. Should you ever find the need to tow the boat with another vehicle, the 7-way connector is much more universal connector and no adapter would...
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  • Can 10 Gauge Wire Fit The Bargman 7-Way Trailer End Connector
  • I pulled one of the Bargman 7-Way Connector, part # 54-77-003 and a piece of 10 gauge wire to see if it would work. Although the 10 gauge wire is tight when inserted next to the post on the back of the connector, I was able to get it to fit and tighten, so it will work just fine for you. I have included a short video that shows the 10 gauge wire being installed on one of the posts at the back of the connector.
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  • Trailer Running Lights Work But No Stop/Turn Lights After Installing New Trailer Wiring
  • Thank you for detailing your troubleshooting efforts with the new wiring on your trailer. First, check the ground wires on both the harness and the trailer. Make sure both are tightly affixed to a clean bare metal spot on the vehicle and trailer frames. You can sand off paint and secure the wires to a new grounding point if needed. A weak ground can cause all sorts of weird behavior with lighting. Check all wiring for signs of cracks or worn spots in the insulation that could cause...
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  • Troubleshooting Both Trailer Blinkers that Activate When One is Applied
  • If your trailer was able to connect to the part # PK11410 the problem is not that your vehicle needs a different style connector. The problem would be that there is an issue with your wiring. It sounds like your blinker circuits have shorted out to each other and when you turn on either blinker they both illuminate. First thing you should do at this point is test the 6-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight...
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  • Troubleshooting Trailer Turn Signals that Work with Headlights Off But not On
  • It sounds like the wiring of your trailer is at fault based on what you described. It sounds like your brake/turn signal functions are run to the running light circuit of your trailer. However, you should first test the wiring of your vehicle to make sure the problem is on the trailer side. First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied....
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  • How to Tow a Trailer Designed for a Harley Streetbike with a Vehicle with a 4-Way
  • We have what you would need to make the adapter you would need, but we don't sell one ready to go. What you will first need is the # PK12720 for your trailer to plug into, next you will need a signal converter to take the combined signal of your Jeep's 4-way to the separate signal of your trailer. For that you would want the # C56196. Lastly, you would need # HM48110 for a 4-way to plug into the Jeep 4-way. When connecting the converter to the 4-way the wires will match up color for...
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  • Why a Powered Trailer Taillight Converter is Recommended for a 2010 Mercury Marquis
  • The # 119179KIT is the recommended powered taillight converter for your Grand Marquis. It does draw the power needed directly from the vehicle battery rather than pulling it through the vehicle's taillight circuits. The direct battery connection provides a more reliable power source, plus it serves to isolate the vehicle wiring from that of the trailer, protecting it from any short circuits. The 2010 Grand Marquis uses a combined wiring system which combines the brake lamps and turn...
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  • Can the Prodigy RF Trailer Brake Controller be Used with a 2011 Lexus RX 450h Hybrid
  • The Prodigy RF brake controller # 90250 requires the 12 volt circuit be active in order for it to work. If your 2011 Lexus RX 450h hybrid model also has a regular vehicle battery and not just the large hybrid battery system then what you can do is run a wire to the 12 volt circuit from the vehicle battery via a 40 amp circuit breaker # PK54540. For wire you can use # 12-1-1. Change the number in the quantity box to the total length of wire you think you will need in feet. I recommend...
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  • Can 7-Way Trailer Connector Vehicle Tester be Used on a 2007 Chevy Silverado
  • Yes, you can use 7-Way vehicle side trailer connector tester # TR20117 on any RV style 7-Way trailer connector, also called a 7-Way blade style connector, including the one on your 2007 Chevy Silverado!
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  • What are the Wire Colors/Functions on Factory 7-Way Wiring on a 2003 Chevy Silverado 3500
  • On your 2003 Chevy Silverado 3500 with the wire bundle the Yellow Wire is the left turn and brake lights, Dark Green Wire is the right turn and brake lights, Brown Wire is for the tail lights, and White is the ground. Often if the loom is cut back, two more wires will be found. The Light Blue wire provides a lead for a camper shell brake light. The other, a Light Green wire, is for the reverse lights. As far as the brake output wire and the 12 volt circuit I am not sure what color wires...
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  • Installation of Tow Ready Universal Trailer Wiring Harness # 119179KIT on a 2006 Volvo S60
  • The Tow Ready # 119179KIT is not a vehicle specific item, so there aren't vehicle specific instructions available for it. However, I'd be happy to walk you though the process. You'll want to locate the wiring harnesses that feed the taillight assemblies. Accessing the rear of the assemblies as if you're changing a burned out bulb is the easiest spot to get to the wiring. Have a helper activate the left turn signal, and use the tester to probe the wires until you find the wire that makes...
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  • Troubleshooting Trailer Brakes That Remain Engaged When Trailer Is Connected To Vehicle
  • The first thing to check is the connectors to make sure there is no corrosion present. That can cause a variety of problems. If that checks out you will need to do some other testing. You can sever the blue wire about 4 to 6 inches from the back of the brake controller and see if the problem still exists. If it does, then you have something wired incorrectly, or the brake controller needs to be replaced. I have attached a drawing that shows how the wiring should be run for a brake controller....
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  • Boat Trailer Running and Brake Lights Work But No Turn Signals with 2009 Dodge Journey
  • The first thing to do is determine if the issue is on the vehicle side or the trailer side. To do that you will disconnect the trailer from your 2009 Dodge Journey and use a circuit tester # 3808 to determine if the wiring harness is working properly. Have someone sit in the vehicle and turn on the blinkers while you first test the wires going into the converter box from the tail light connection (yellow is left turn and green is right turn). If signals are not right going into the box...
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  • What are the Functions and Pin Locations for a Vehicle Side 7-Way on a 2001 Ford F-350
  • Vehicle manufacturers can use any color wire they want for any function because there isn't really a standard. You have to go by function. A 2001 Ford F-350 7-Way is going to have the same functions on the same pins as most any other 7-Way on a vehicle. I have included a diagram showing the functions both at the front and back of a 7-Way. Again, ignore the colors and look at just the functions. Also, you can use a circuit tester such as # 3808 to test the wires to determine function....
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  • Trailer Wiring Harness Recommendation for a 2014 BMW X1
  • We have two curt wiring harness part numbers that have 56146 in them. Part number # 56146 and part # 56146KIT that also includes the wiring and fuse holder for routing the power wire of the kit up to the vehicle battery. Both of these converters have the SMT (surface mount technology) circuit board that makes them very reliable as opposed to the older style of circuit board that other harnesses may have. Since your 2014 BMW X1 requires the wire get run all the way up to the battery you...
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  • Multiple Trailers Right Brake Lights and Turn Signals Not Working with 2003 Chevy Tahoe
  • First, the easiest thing to check are the fuses related to the tow package wiring on your 2003 Chevy Tahoe. Check the owner's manual to find the fuse locations to check them. If the fuses are not the issue Then there is some testing you can do. Make sure that the vehicle side trailer connector is clean and free of corrosion at the pins and where the wires attach (if accessible). Then you can test the connector using a circuit tester such as # 3808. You will activate the function that...
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  • Trailer Wiring Harness Recommendation for a 2016 Mazda CX-5
  • The recommended trailer wiring harness we carry for your 2016 Mazda CX-5 is the Tow Ready wiring harness part # 119178KIT. This kit is compatible with LED or incandescent bulbs so it would work well.
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  • How to Tow a Jayco Trailer with a 6-Way Square Connector with a Vehicle that has a 7-Way
  • Sounds like you have a 7-way connector on your 2009 Pilot and are looking for a way to connect it to your Jayco pop up that has one of their square style 6-way connectors. Since there isn't an exact adapter for what you are trying to do your best option would be to remove the square connector from the trailer and install a # A7WCB in place of it. This will allow your trailer to be towed much easier by other vehicles in the future as well. You will want to verify the functions of the...
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  • Wiring Trailer Brake Magnet with 1 Black Wire and 1 Red/Black Wire
  • On many brake magnets it does not matter which wire is ground and which is power. It is likely that the red/black wire was used as the power wire and the all black wire was the ground.
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  • How to Charge a Trailer Battery with a Vehicle with a 4-way
  • To charge the battery on your trailer that has a 7-way with your 2013 Subaru Outback that has a 4-way on it currently you can use the # 37185 that you referenced, but you will need to run the black wire of the adapter up to the battery with 10 gauge wire like part # 10-1-1 (sold by the foot) through a 40 amp breaker like part # 9510. This will activate the circuit required to charge your trailer battery. I attached a video that covers how to install a brake controller in a similar...
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  • Wiring Third Brake Light and Dome Light on a Leer Camper Shell on 2007 GMC Sierra 2500 HD New Body
  • The one place I know for sure to access the CHMSL circuit on your 2007 New Body Sierra is under the dash. You will need to look for a wire bundle under the dash, to the left of the steering column. There should be a white tag holding the wire bundle together. There should be an orange wire and that is the CHMSL wire. You can attach a length of wire to this orange wire, route it through the firewall, under the truck, and to where ever it needs to go on the camper shell. Be sure to avoid...
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  • Recommended 7-Way RV Adapter For 2003 Land Rover Discovery ll With 7-Way Round Connector
  • If you have the European style plug on your Discovery ll, you will need a converter because the European style plug has separate brake and turn signals. US RVs and trailers have a combined brake and turn light system. To convert the wiring on your Land Rover, you would first star by cutting off the European 7-way round plug. Using a circuit tester like part # 3808 you can have someone sit in the front of the vehicle and run through the functions while you test each wire for function....
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  • Will the Power Grip 90-Degree Locking RV/Marine Power Cord CAM55572 Work with a FCKIT52-PS
  • Yes, I looked up the outlet you referenced and it appears to be a 50 amp socket like what the # CAM55572 that you referenced is designed to work with.
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  • Trailer Turn Signals Do Not Blink In Tandem with the Vehicle Turn Signals
  • Usually when towing a trailer the turn signals will blink together with the tow vehicle and not alternate like what you are describing. So I would say what you are experiencing is not normal. It is hard to say if it is a problem with the trailer wiring harness # C56254 or something that went wrong during the installation process. I would make sure that all of the grounds are attached to clean and corrosion free bare metal surfaces. I also recommend checking the trailer side connector...
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  • Wire Length of TorkLift Wiring Extension # TLW6524
  • I went to our warehouse to get the TorkLift wiring extension # TLW6524 to provide you the measurements from the Y to the 3 separate 7-way connectors. With the help of a co-worker we straightened it out as tight as possible and the measurement was 8 feet 10-1/2 inches to the base of the 7-way connector. The other two 7-way connectors will measure 6-1/2 inches from the Y to the base of 7-way (shortest of the 3 measurements), and the other is 3 feet 6 inches from the Y to the base of 7-way.
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  • Brake Controller Wiring Harness for a 2014 Toyota Tacoma
  • Actually the 2014 (as well as the 2015) Toyota Tacoma still use the # 3040-P harness for a Tekonsha brake controller. If you have found a connector that looks different on your 2014 Tacoma then it is not the right connector. The connector you are looking for could be difficult to find if it is not just hanging out. You may have to fish it out from above other wiring harnesses or behind trim panels. If you are using a different brand controller let me know what it is and I can determine...
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  • How To Determine Wire Functions On 2014 Honda Pilot For Trailer Harness
  • Since auto manufacturers can many times use different wire colors so you will want to test the wiring on your Honda Pilot. I recommend using a circuit tester like part # 3808 and check each of the wires for function by having someone run through the functions while each wire or pin in the connector is tested. Typically, the purple wire is for the reverse lights, but again since the wire colors may be different the best way to know for sure is to use a circuit tester. I have attached...
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  • Hopkins 7-Way Trailer Connector to Older Featherlite Wiring Recommendation
  • The diagram you attached shows a 7-way wired up in what is considered the "traditional way." If you check out the chart I attached you will see the three ways (really only 2), that a 7-way can be wired. The Featherlite is wired up like the diagram on the left. Now to wire up the # H20046 all you would need to do is wire up the connector by FUNCTION and not color. If your trailer has the same wire colors as the diagram you attached the blue wires would match up, the brown of the trailer...
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  • Trailer Right Turn Signal and Brake Light Not Working
  • The right turn signal/brake light not working on a trailer could be the result of a bad ground, broken wire, corroded trailer connector or a blown fuse or relay on the tow vehicle's tow package wiring. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
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  • Difficulty of Replacing Damaged Trailer Wiring
  • Replacing vehicle- or trailer-side wiring is not difficult as long as you get the correct replacement part. It is often easiest to do this kind of job when you have a circuit tester like # 40376 to help you confirm what each vehicle wire does, and to have a 12V battery to test what each trailer wire does. Matching up the functions is important since trailer and vehicle wire colors are not standardized. If you'll need to splice wires you might want to consider a junction box like # 38656...
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  • 4-Way to 5-Way Adapter Recommendation for a Reverse Lock Out Solenoid
  • What you need to convert the 4-way on your 2002 Ford Super Duty is the part # 20036. This will plug in to your 4-way and will then allow you to run a wire to tap into the reverse light circuit of your vehicle so that your reverse lockout solenoid will activate in reverse.
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  • Replacement Trailer Connector for 2007 Dodge Ram Cab and Chassis and How to Wire in Camper Lights
  • First, if your 2007 Dodge Ram cab and chassis model came with a factory installed 4/7-Way then you can use # HM40975-11933 to replace it. It plugs into the factory wiring harness under the truck. What I would do is to wire the camper light wires to either a trailer side 4-Way or 7-Way connector, depending on what all functions are needed, and plug that into the trucks trailer connector instead of hardwiring it in. For a 4-Way you can use # HM48110. White is ground, brow is running...
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  • Red Dots Light Up On Brake Controller But No Power at the 7-Way Connector
  • Since you mention that you don't have 12 volts to the trailer, there is a good possibility that the issue is your brake controller. In order to test the controller you will want to sever the blue wire several inches from the back of the controller. Using a circuit tester like # 3808, test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override. If it shows power at any other time or never shows power when it is supposed to then...
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  • Adapter for 4-Way Flat Vehicle Connector to 6-Way Round Pin Trailer Connector
  • If you only need the basic lighting functions provided by the 4-Way (left/right turn, brake, and running lights) all you will need to do is plug the 4-Way end of the Adapter 4 pole top 6 pole, # 30637, into your vehicle 4-Way. The trailer 6-Way will then plug into the 6-Way receptacle on the adapter. You will also need to ground the white wire on the adapter to the vehicle frame at a clean and corrosion free metal surface. The remaining wires (blue for electric brakes and black for...
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  • Troubleshooting Right Side Turn/Brake Signal on Boat Trailer
  • The first step would be to determine if the problem exists on the tow vehicle or on the trailer. Use a circuit tester like part # 40376 on the trailer connector at the rear bumper of the vehicle. Activate the right turn signal, and for a 4-pole trailer connector, test the pin that is fed by the green wire. For a 7-way trailer connector, test the pin in the 3:00 position. With the turn signal on, the tester should blink along with the turn signal. Pressing on the brake pedal should also...
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  • Troubleshooting Open Running Lights Circuit
  • Sounds like the problem lies either with the trailer connector on the trailer, or in the trailer wiring itself. A loose connection or insufficient ground connection is the most likely culprit. First, check the connector on the trailer, look for any corrosion or damage that would prevent the signal from the running light circuit from getting through to the trailer. Then, make sure the white ground wire from the trailer connector is securely connected to a clean, non corroded spot on the...
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  • Locating Trailer Running Light Fuse
  • The fuse box location and the actual spot in the fuse box where the running light fuse is located will depend on the year, make and model of your vehicle. You can usually find the main fuse box under the hood. Your owner's manual should tell you where the fuse box is located and where in particular you can find the running lamp fuse. All this being said, you'll want to make sure the wiring on the trailer is in good shape before you start changing fuses. If there's a short circuit...
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  • Installing 4-Pole to 7-Way Trailer Connector Adapter on 2005 Dodge Ram
  • I'm not sure which adapter you are speaking of. A 4-pole to 7-way adapter that would plug into the vehicle's existing 4-pole like part # 37185 would install as follows: The 4 pole on the adapter would plug into the 4 pole on the truck. Once the loose white wire is grounded to the truck frame, this should provide you with functional trailer lighting circuits. The blue and black wire is usually ran to the front of the truck. The black wire would connect to the positive battery terminal...
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  • Trailer Wiring Harness Recommendation for a 2011 Volkswagen Tiguan
  • The trailer wiring harness part # 119190KIT has been confirmed as a fit for your 2011 Volkswagen Tiguan. It would install just like the 2009 Tiguan in the video I attached.
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  • Gauge Wire Used for the Wesbar 4-Way part # W787268
  • The gauge of wire used on the 4-Way part # W787268 that you referenced is 16 gauge.
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  • Does the Brake Output and 12 Volt Accessory Wires of the 4-Way to 7-Way Adapter Need to Be Run
  • If your trailer does not have trailer brakes and all you need are taillight signals you would not need to run any additional wire to install and use the # 30717 on your vehicle. Just plug in your 4-way and you would be good to go.
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  • Will the 7-Way to 4-Way Adapter HM47365 Fit a 2014 Toyota Tacoma
  • As long as your 2014 Toyota Tacoma has a functional 7-way installed on it the part # HM47365 that you referenced will work well for you.
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  • How to Activate Trailer Brake Output and Trailer 12 Volt Circuit on a 2013 GMC Yukon
  • The two circuits you referenced will need to be connected under the hood of your 2013 GMC Yukon. If you check out the help article I attached you will see exactly how to do this. This article also covers how to install a brake controller which it sounds like you are looking to do. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional...
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  • Trailer Wiring Harness for a 2006 Volkswagen Passat
  • Instead of having to cut and splice into the tail light wiring on your 2006 Volkswagen Passat you can install a T-connector harness # 118562 as long as your Passat is not a 4Motion model. To install a hardwire harness the only way to know for sure the functions of the wires is to test them with a circuit tester such as # 3808. On a harness such as # C56201KIT the green wire would go to the combined function wire on the right side, the yellow wire goes to the combined function wire...
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  • Trailer Running Lights Not Working After Installing New Light and Also Trying to Reuse Old Light
  • It does sound like a short or a ground issue. Check the trailer wiring for any pinched or damaged wires and repair as needed. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer...
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  • Recommended 6-pin Connector And Brake Controller For Motorcycle Towing Trailer With Electric Brakes
  • You will want to find out from the trailer company what the functions of the wires on the trailer connector will be so you can wire your motorcycle connector. Many times the center pin is the one used for the brake controller circuit. I recommend the Pollak 6-Pole, Round Pin Socket, part # PK11609. You will need to cut the 4-way connector off right behind the plug and wire the # PK11609 to match the trailer connector. You will want to run the pin that matches the brake circuit on the...
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  • Troubleshooting Factory Trailer Wiring that has No Power
  • My first thought would be blown fuses, so I would be sure to double check all fuses and relays related to the tow package. This information will be listed in your owners manual. Check to ensure you are getting power at the trailer connector on your vehicle. Using a circuit tester like # 40376, test the vehicle side connector since it's factory trailer wiring. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector...
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  • Will Electric Trailer Brake Controller Generate Output When Vehicle is Not Moving
  • Some brake controllers, the preferred proportional type like the Prodigy P2 # 90885, will generate an output signal from you pressing the brake only when you are moving. This is because this type of controller uses a motion-sensing accelerometer to tell the controller to generate output in proportion to your tow vehicle's deceleration. Time delay type controllers such as the Curt Venturer # C51110 will generate output when you press the pedal or press the manual override, even if you are...
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  • Replacement Wishbone 4-Way Recommendation for a Trailer
  • You are correct. Based on the wire colors that you listed you would want a wishbone 4-way like the part # A20WB. The colors of this 4-way would match up exactly to what you have listed with the only addition being the white wire of the new 4-way running to a clean metal surface on your trailer. The brown wires of the 4-way will be run to the yellow/brown and the green/brown wires. It doesn't matter which one as it's the same circuit (running lights). I attached an install video...
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