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Expert Answers about Wiring


  • Trailer Brake Lights Do Not Work when 2009 Volvo XC70 Rear Hatch is Closed
  • You have a 2009 Volvo XC70 and the video is on a 2011 model year so it is very possible that installation of a trailer wiring harness such as # 56146KIT would not be exactly the same. In this case though it is moot since it is just a matter of locating the proper wire. So what you are saying is that the vehicle has a feature that moves where the brake lights are illuminated based on if the hatch is open or not. This is actually not uncommon. There should still be a wire with the others...
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  • With Running Lights or Brake Lights On Turn Signals on Trailer Alternate
  • Tail light ground wires are usually white so that doesn't seem odd. This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. 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...
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  • 4-Pole Trailer Wiring Harness for 1972 International Scout II
  • For your 1972 International Scout II we offer a 4-pole pigtail wiring harness kit that includes a circuit tester to allow proper identification of the function carried on each vehicle wire (wire colors are not fully standardized so testing is the way to go). I have linked a representative installation video as well as a video on how to use the tester. This 4-pole can be used with mounting bracket # 18144 from TowReady.
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  • Total Length of the TorkLift Wiring Harness Extension # TLW6042
  • The 48 inches of length that the TorkLift Wiring Harness Extension # TLW6042 has is the distance from end to end including the connectors.
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  • Recommended Trailer Wire Kit For 2010 Audi A4 Avant Or 2010 Volkswagen SportWagen
  • If you are talking about purchasing a 2010 Audi A4 Avant wagon, we do offer a trailer wiring kit that will work for you. It is the Curt PWM Powered Converter with Wiring Kit, part # C56201KIT. This kit includes all of the hardware needed for installation. I have also included a helpful article that you can check out. To make certain you are using the correct wires I recommend using a circuit tester like part # 3808. If you decide on a 2010 Volkswagen Jetta SportWagen, the trailer...
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  • Replacing Factory 7-Way with a 4- and 7-Way on a 2013 Nissan Frontier
  • The factory 7-Way on your 2013 Nissan Frontier should be able to come apart like in the picture I have included. If it can then you can replace the 7-Way part with # HM40975. Or you could just use an adapter, # PK12716, for times when you need a 4-Way flat.
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  • Recommended Trailer Wiring Harness for 2011 Dodge Journey with LEDs
  • It is always a good idea to use LED lights on your trailer as they last longer and tend to illuminate sharper than incandescent lights and draw less power from your vehicle battery. The Hopkins Active Taillight Converter # 46255 is a confirmed fit for your 2011 Dodge Journey with LED lights. This system is designed to splice into the existing wiring on your vehicle, and provide a 4-way connector at the rear of your Dodge Journey. It also isolates and protects the tow vehicle from trailer...
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  • Parts Needed to Install a 7-Way on a 2011 Subaru Outback Wagon from Scratch
  • If you are starting from absolutely no trailer connector on your 2011 Subaru Outback Wagon you will want to first start with a 4-way. For that you will want the Curt Harness part # C56040. Now to convert to a 7-way that will also have a 4-way connector available you would want the 7-Way Adapter part # 37185. This will plug into the 4-way you installed and then so that your wireless brake controller would have power you would only need to run the black wire of the # 37185 to the positive...
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  • Troubleshooting Trailer Wiring That Blows Vehicle Fuse When Brakes are Applied
  • You are overdrawing the brake light circuit with the load you are putting on it from your trailer wiring. This is either because your trailer has a short on it that needs to be fixed, or you are just overdrawing the circuit. Most likely it's just overdrawing, but you should still inspect the wiring of the trailer looking for any cut or exposed wire and fix as necessary. Now if the problem is just that you are overdrawing the circuit you have two options. You can convert your trailer...
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  • Trailer Wiring Harness Recommendation for a 2005 Cadillac SRX V8 Rear Wheel Drive
  • We have some trailer wiring harnesses that have been confirmed to work with the 2005 Cadillac SRX, but they are all the universal hardwire kits, not T-connector style harnesses. For your SRX, we recommend installing the Curt Circuit Protected Tail Light Wiring Kit, # 56146KIT. We have installed this harness on a 2004 SRX, so I attached the installation video for you to check out. I have also attached the installation instructions. The installation for the 2004 SRX will be the same for...
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  • Compatibility of Bargman # 54-77-003 7-Way Connector With # 50-87-004 Vehicle End Socket
  • You can indeed install the Bargman 7-way connector # 54-77-003 onto the # 50-87-004 Sealed connector. However, there is a connector loop like this that's already constructed, part # 20027. If you're wanting to use this item to install a 7-way connector in your truck bed for a fifth wheel, we offer T-Connectors like # 41157 that would plug inline with the truck wiring harness that feeds the 7-way connector on the bumper. Some of these are vehicle specific, so if you'd be interested in...
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  • Wire Colors and Functions for 4 Wires Pulled Out of a Trailer Connector
  • Is this the trailer side connector? It is likely that you have white for ground, yellow for left turn and brake lights, green for right turn and brake lights, and the 2 brown wires are running light circuits, one for the left side (yellow/brown) and one for the right side (green/brown). I imagine that you have a 4-Way flat connector. On the trailer side the one covered pin is the ground, next to it is the running light circuit, then left turn/brake, and last is right turn and brakes. If...
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  • Adding a 7-Way and Brake Controller to a 2012 GMC Terrain and Old Trailer
  • Trailers have combined turn signals and brake lights on the same circuit so you wouldn't tap into one of those otherwise the brakes would turn on with the blinker like you said. You are going to have to add a 7-Way connector to the 2012 GMC Terrain and to the trailer. And you will also need a brake controller. Since your Terrain already has a 4-Way you will just need # ETBC7 to add the 7-Way. I have included some links that show and explain the ETBC7 installation as well as the brake...
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  • Wiring In a New Trailer Side 5-Way Trailer Connector
  • Wiring by color can prove to be a bad idea since there technically isn't a standard for wire function and color. On Hopkins trailer side 5-Way, the white wire is the ground, brown is for running lights, yellow is left turn/brake lights, green is right turn/brake lights, and blue goes to the reverse lockout solenoid like you said. To determine the functions of the wires on the trailer you could either trace each one back to see where each goes. Or you could apply 12 volts of power...
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  • Trailer Lights Work when Vehicle Is Off, But Do Not Work When Vehicle is On
  • That is interesting. What about testing the 4-Way without the hazards on. Instead, have a friend sit in the vehicle and operate each light function with the vehicle off and with the vehicle on. It could be an issue with just the hazards on. I have included a link to a help article that explains how you can go about troubleshooting the trailer wiring. If it is a bad ground, Ground problems normally show up when there is more draw on a system such as when you have the running lights...
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  • Difference of 4-Way Trailer Connector with 4 Wires Compared to 4-Way with 5 Wires
  • The 4-Pole Trailer End Connector # 18004 is meant as a replacement for a trailer side 4-Way connector that has been damaged. That is why it is so short at 12 inches long. This is a standard 4-Way with one white ground wire, one brown running light wire, one yellow left turn/brake light wire, and one green right turn/brake light wire. If the one you are replacing has 2 running light wires then you would want a wishbone harness, # W002230. I have included video reviews of both harnesses...
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  • Troubleshooting Brake Controller On 2002 Ford F-250 Heavy Duty Truck
  • The red indicator light you have on your brake controller should start out dim and when brakes are applied or if the manual control is used, and increase in brightness as you increase the output. It sounds like your controller is working properly when the trailer is not hooked up but is acting opposite of how it is supposed to work when you hook the trailer to your vehicle. I would use a circuit tester like part # 3808, and make sure all the wiring connections are receiving current...
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  • 4-Way Flat Trailer Connector with LED Test Lights Has One Light that Stays On All the Time
  • If the LED test light is staying on then it is receiving power from somewhere. On some vehicle side 4-Ways that require a direct connection to the battery this can happen. It will not be a problem as long as the trailer is unplugged. In other cases there could be dirt or corrosion buildup that is causing a short. Make sure the connectors are clean and corrosion free inside and out. If the LED light connector is on the trailer side and is lit up when unplugged then the only thing I...
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  • How to Protect Trailer End Connector From the Weather
  • I looked through our product offerings and was honestly surprised when I saw we didn't offer a cover for a trailer connector. Since the tape didn't work for you, have you considered using some of that Press'n Seal plastic wrap? You could use a piece to cover the connector, and secure the wrap with the duct tape. That way, any tape residue would remain on the wrap and not the connector itself.
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  • Does the Brake Controller Install Kit # ETBC7 Come with a # 37185
  • The Brake Controller installation kit part # ETBC7 that you referenced actually includes the 7-way connector part # 37185 that you referenced also so you would only want one or the other depending on the situation. If you have trailer brakes you would want the # ETBC7, if your trailer does not have brakes then the # 37185 would be the correct part. I attached installation instructions and an install video for the # ETBC7 for you to check out. For a brake controller I would recommend...
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  • Converting European 7-Way on 2014 Volkswagen Golf to US Spec 7-Way
  • You will need to replace either the connector on the VW or the one on the trailer. It would be easier to change the one on the VW because a US spec trailer has different functions than a European trailer and the functions would not match up. US trailers have combined brake lights and turn signals. A European 7-Way has a separate circuit for each light. Since your Golf already has a trailer connector all you will need to do is cut off the 7-Way end. Then you would use a convert to combine...
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  • Recommended Replacement 4-Way Connector For 1960 Trailer
  • We do offer flat 4-way trailer connectors. I recommend the Wesbar 4-Pole Flat Connector w/ Jacketed Cable, part # W787264. You would need to cut the connector off of your trailer and test the wires on the trailer for function using a 12-volt power source and a circuit tester like part # 3808. I recommend using a junction box like part # 38656, to protect the wiring. For ring terminals I recommend part # DW05702-1 for 14-16 gauge wires and part # 44-5310A for 10-12 gauge wires. I...
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  • Brake Controller Installation on 2006 Fleetwood Terra 32S Motorhome
  • You would almost certainly need to install a controller. Factory installed brake controllers are fairly common on full sized trucks, but not so much on motorhomes. You'd need to install a brake controller. I'd recommend the Tekonsha Prodigy P2, part # 90885. The P2 is extremely easy to use and is highly rated by our customers. The controller would install under the dash, most commonly to the right of the steering column so you don't bang your knee on it when getting in and out of...
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  • Will Curt Trailer Connector with Backup Alarm, # C57101, Fit 2009 Ford e-250 Van w/Factory 7-Way
  • Yes, your 2009 Ford E-250 van uses the same connector to plug into the back of the 7-Way as the F-series trucks. So you can use Curt Trailer Connector with back up alarm, # C57101. I have linked a video review for you.
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  • Correct Trailer Wiring Harness for 2007 GMC Sierra Classic
  • You will want the OEM Style 7-Way and 4-Way Trailer Connector, # HM40975, which will allow the use of 7-Way and 4-Way wiring with no additional adapters. You will need to make a few more connections under the hood of your 2007 GMC Sierra Classic to complete the install. See the FAQ page I attached for how this is done.
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  • Rewiring and Installing New Tail Lights, Wiring, and Trailer Connector on a Trailer
  • It looks like you have the lights and grommets, wiring harnesses, hardware, reflector, wire loom and butt connectors. But the butt connectors will be too large for the wiring harness. You will need 22 to 18 gauge 5-pack # 05730-5. The wiring on the wishbone harness is 19 to 20 gauge. You may also want to invest in some dielectric grease # 11755 to keep moisture and corrosion out of the electrical connections. And if your trailer has any clearance lights, those are missing for the...
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  • Butt Connectors for 20 ft. Wishbone 4-Way Trailer Wiring Harness with 30" Ground Wire
  • For the wishbone trailer wiring harness # A20WB you can use butt connectors # 05730-5 which fit 22 to 18 gauge wire. This is a 5-pack. The wire gauge for the wishbone harness is 19 to 20 gauge.
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  • Replacement 5-Way Flat Trailer Side Connector for a Boat Trailer
  • It sounds like you have a version of a 5-Way flat wishbone harness like # W002290. A wishbone harness will have 2 running light wires attached to one running light pin. White is ground, the two brown wires are for running lights, yellow is for left turn and brake lights, green is for right turn and brake lights, and blue is for a reverse electric lockout solenoid. Since the wires on your trailer do not match up you would have to trace each wire back to determine the functions. Or...
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  • Removing European 7-Way and Installing US 4/7-Way on a 1999 Land Rover Ranger Rover
  • A European 7-Way does the same thing that a US 4-Way does so the problem you would run into is that you would still need a converter of some kind because the European 7-Way has separate brake light and turn signal circuits. US trailers have combined turn signal and brake light circuits. What you could do is cut off the European 7-Way. Then use a circuit tester such as # 3808 to test the wires to determine the functions. Then you could use converter # 119192 and 4/7-Way connector # HM48470....
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  • Adapting a 7-Pin European 7-Way on 1999 Range Rover to US 4-Way Flat Trailer Connector
  • You would have the same problem using adapter # 118710 as you would with just splicing in a 4-Way. The adapter doesn't convert the separate signals to combined signals used by most trailers in the US. You would need to add a converter, # RM-732, which will take the separate signals and combine them. You could then wire in a 4-Way flat such as # HM48030 on the output side of the converter.
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  • Can 4 to 7-Way Trailer Connector Adapter Be Grounded to Trailer Frame Instead of Vehicle Frame
  • Since the 4 to 7-Way adapter # 30717 is a vehicle side connector it will be mounted on the vehicle. Grounding it to the trailer frame would mean you would have to disconnect that ground every time you disconnected the trailer from the tow vehicle. The trailer side connector already has a main ground connection so this one needs to stay grounded to the vehicle side.
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  • Can a European 7-Way be Connected to a US Spec 7-Way Trailer Connector
  • We do not have an adapter to go from a US style trailer connector to a European 7-Way. My recommendation is to leave the wiring harness on the vehicle and put a 4-Way flat on the trailer. You would need to cut off the Euro 7-Way and in its place use # HM48110 or similar trailer side 4-Way. The functions are white is ground, brown is running lights, yellow is left turn and brake lights, and green is right turn and brake lights. You will need to attach the wires to the existing trailer wiring...
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  • Testing Wires on a Trailer Using 12 Volt Power to Determine Functions
  • All you would have to do is use a 12 volt power source, a battery, the 12 volt circuit on your truck side 7-Way, attach one end of a wire to it and the other end to whatever circuit you want to power on the trailer side. Avoid touching the copper strands with your bare hands. You will likely not be able to damage the battery in the process. To keep the wire attached to the 12 volt power source you could attach it to a post on a battery using a ring terminal or use electrical tape to hold...
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  • Wiring Harness Recommendation for a 2012 Volkswagen Passat
  • The correct wiring harness for your 2012 Volkswagen Passat is part # C56201KIT. I have included an installation video for you to check out. I spoke with my contact at Curt and you could try grounding the red wire along with the white wire, on the wiring harness that you mentioned, but since this has not been tested by Curt or anyone here at etrailer, we can not guaranty that this will work for you.
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  • Replacement 7-Way Round Pin Connector for a STEELBRO Side Loader
  • We may have a 7-Way round pin connector for your Steelbro side loader unless it has the same functions as a semi-truck/trailer 7-Way. If that is the case we will not have a replacement. But for a 7-Way round pin vehicle side we have # PK11720 or # PK11-729. And for a trailer side we have # PK11700 or # PK11702. I have linked our help article on trailer wiring that shows how the various connector types are pinned out.
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  • Brake Controller Installation Instructions For 2008 Toyota Highlander
  • I have attached a couple of drawings that show how the wires are routed when installing a brake controller, and how the wires are run from the 7-way connector on your 2008 Toyota Highlander. I have also included a couple of helpful articles that explain brake controller installation and how to install a 7-way connector. You can check out the attached video that shows a brake controller installation on a Toyota Highlander. The year of the vehicle may be different from yours, but the...
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  • Compatibility of Curt 7-Way and 4-Pole Trailer Connector # C57101 with 2013 Silverado 1500
  • According to Curt, the # C57101 7-Way Blade and 4-Way Flat trailer connector you referenced is indeed compatible with your 2013 Silverado in that it would be compatible with the US car connector that's plugged into the existing 7-way. However, it will not fit through the cut-out in the bumper, and would need to be mounted in an alternate location.
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  • Horse Trailer Electric Brakes Lock Up When Backing Up the Trailer
  • There could be a short in the truck or trailer side connector that occurs when the vehicle is put in reverse. The center pin is typically the reverse light circuit. You will want to make sure that the truck and trailer side connectors are clean and free of corrosion inside and out. Inspect the power wires to the magnets and look for pinched, frayed, or damaged wires and fix as needed. Make sure the ground wires are attached to clean and corrosion free bare metal surfaces.
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  • Should Ring Terminals be Used to Attach Wires to the Back of a 7-Way Trailer Connector
  • Small ring terminals domake the installation of the wires to the back of the 7-Way # PK12706 easier and it will lessen the chance of stray strands touching the wrong terminal and causing a short. The heat shrink type of ring terminals such as # DW05738-1 would be best for keeping out moisture which will lessen the chance of corrosion causing a short.
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  • Trailer Wiring Harness for a 2013 Infiniti EX37
  • Trailer wiring harness # 119179KIT will fit your 2013 Infiniti EX37. This is a hardware trailer wiring harness which means that it fits many vehicles. You will need to test the vehicle tail light wiring using the included tester to determine the wire functions on the vehicle and then make the connections to the harness accordingly. I have included a link to a video that you can use as a guide on testing the wires.
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  • How to Convert a 4-Way to a 7-Way to Tow a Horse Trailer with a 2014 Jeep Wrangler
  • If the trailer doesn't have brakes and all you need are taillight functions all you would need is the part # 37185. If you need something to convert the 4-way to a 7-way and install a brake controller you will need the part number # ETBC7 instead plus a brake controller. 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. I attached installation...
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  • Troubleshooting Stop/Turn Signals on Trailer Wiring Not Functioning on a 2005 Nissan Frontier
  • It really sounds like you are missing the two blue relays like part # 38666-1 from the relay box under the hood of your 2005 Nissan Frontier. I would recommend you double check that you replaced the correct relays. In some of the Nissan relay boxes there are two sets of blue relays. It is possible that you replaced the wrong set of two. Another possibility is that the grounds of your trailer aren't sufficient. Check the grounds of your taillight assemblies, make sure they are connected...
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  • Trailer Wiring Harness Recommendation for a 2014 Jeep Grand Cherokee without Tow Package
  • I did some checking and it looks like the correct wiring harness to give you a 4-way at the back of your 2014 Jeep Grand Cherokee would be the Curt Wiring Harness part # 56146KIT. I attached installation instructions and an install video for you to check out.
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  • Troubleshooting Trailer Brake Lights that Go Out When Headlights are On
  • There are two sets of grounds you need to check. The grounds for the taillight assemblies and the main ground for the trailer that runs from the trailer connector to the frame of the trailer. Between one of those grounds lies your problem as what your are describing is a textbook example of an insufficient ground. Another possible solution (although unlikely) is that you are overdrawing your trailer light circuits from your tow vehicle. You may have installed too many lights on the trailer...
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  • Install Video for Curt Trailer Wiring Harness # 56146KIT on 2000 Mercedes Benz ML320
  • We've installed the Curt # 56146KIT on a 2003 ML350 but not a 2000 ML320. You can see the footage by clicking the provided link. The procedure for your ML320 should be very similar to what's shown in the video, but it's entirely possible that the wire colors on your ML320 might be different from what's shown in the video. You'd need to use the circuit tester included with the kit to verify which circuits of the vehicle wiring serve which purpose.
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  • How to Add Reverse Lights to a Trailer That has a 4-Way Connector
  • What you will need to do is upgrade your 4-way to a 5-way. The fifth circuit will carry the reverse light circuit to the reverse lights you install on your trailer. On the trailer you will want to cut off your 4-way and install the part # A25W5B in it's place. The fifth circuit will run to the trailer lights to power them. On your vehicle you will want to install the # 20016. You will remove your current 4-way and wire this on it's place. The fifth blue circuit will run to the reverse...
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  • Troubleshooting Trailer Wiring When Lights Are Not Working
  • To test the wiring on your trailer, you will need a circuit tester like part # 3808. The first thing you want to do is test the wiring connector at the back of your vehicle. If the connector checks out, then you can move to the trailer for testing. If none of the trailer lights are working, you can test the wires on the back of the trailer-side connector with the circuit tester when it is attached to the vehicle. If the wires from the connector test okay, you can move to the lights...
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  • Trailer Side 4-Way Recommendation with Wishbone Wiring for the Running Light Circuit
  • Sounds like you are looking for a wishbone trailer wiring harness. One that has two wires run to the (brown) running light circuit. I have a solution for you, but the # HM48192 would not be the correct part. You would want the part # A20WB instead as it has a wishbone setup already with two wires running out of the running light circuit pin.
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  • Wiring a Semi Truck 7-Way to an RV Style 7-Way on a Trailer
  • To tow a trailer that uses a RV style 7-way blade-style trailer connector with semi that has a 7-pin connector, you will need to construct an adapter that also combines the brake signal into the right and left directional signal pins. This can be done by using a female 7-pin socket # PK11720 to accept the plug from the semi, a tail light converter # 119178 and a female 7-way RV blade-style socket # PK12707. The converter would be wired in between both sockets to combine the brake light...
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  • How to Mount 7-Way to 7-Way LED Trailer Light Adapter # C57003 on 2005 Porsche Cayenne
  • The 7-Way to 7-Way LED Trailer Light Adapter, # C57003, can be mounted to any flat surface under your 2005 Porsche Cayenne using the mounting holes on the top of the adapter. Since the 7-Way to 7-Way, # C57003, has the mounting bracket molded to the top, you would not be able to use this adapter with the Curt Easy Mount Bracket, # C58000.
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  • How to Charge A Slide-In Camper Battery with The Vehicle Battery
  • What you will need is a thick gauge wire, an isolation solenoid like part # TR118665 and a set of quick disconnects like part # DL24086. You will run the wire from the output post of your Dodge Dakota alternator to the positive side of the battery in your camper using the isolation solenoid to prevent the battery from charging unless your truck is on and the quick disconnects for when you remove the camper shell from your truck and need an easy way to connect and disconnect the wiring.
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  • Towing a Motorcycle Trailer with 4-Way Square Connector with RAV4 with 4-Way Flat Connector
  • If you want to be able to tow the trailer with the RAV4 and with the motorcycle you are going to have to wire in a second connector on the trailer to match the 4-Way flat on the RAV4. The issue is that trailers designed to tow with motorcycles will likely have turn signals separate from the brake lights. The 4-Way flat on your RAV4 has combined turn signals and brake lights. This will require a special converter, # 118158, to maintain the separate circuits on the trailer. First,...
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  • Tips for Installing Trailer Wiring Harness 119178 On a 2000 Toyota Corolla
  • Since trailer wiring harness # 119178KIT is a universal fit type of item it does not have vehicle specific instructions. So the instructions are basically the same for all vehicles. You will use the included tester to test the tail light wiring on the vehicle then make the necessary connections. White is ground and connects to a bare metal surface. Red is brake lights only, yellow is left turn signal only, and brown is running lights only. These are all on the driver's side. The green...
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  • Adding a 7-Way Trailer Connector and Brake Controller to a 2003 Toyota Tacoma with 4-Way Connector
  • It does sound like a 4-Way flat was added to your 2003 Toyota Tacoma. But that is a good thing because it will be needed to install the 7-Way. To add the 7-Way (if using an in-cab brake controller) you will need installation kit # ETBC7. This provides the 7-Way, still retains the 4-Way as well, and has the wiring and accessories needed to install the brake controller. I have included some links to the right that show and explain this installation for you. For a brake controller I recommend...
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  • Troubleshooting Trailer Running Lights Not Working
  • First thing you want to do is test the trailer connector of your vehicle with a circuit test like part # 3808 for voltage on the running light circuit. See the diagrams of the various trailer connectors in the FAQ article I attached. If voltage isn't there most likely it's a blown fuse or relay. Check your fuse box legend or owners manual to determine the trailer wiring fuses and replace as necessary. Corrosion on the running light circuit pin of your wiring harness could also cause...
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  • Using Electric Brakes on a Boat Trailer
  • I don't recommend electric brake assemblies for boat trailers because the finish on them is not the best for marine applications and you could run into short problems if the wiring is not properly sealed to keep out water. Instead I would use hydraulic disc brakes. To recommend a brake assembly I would need to know the wheel size you have, the inner and outer bearing numbers stamped into the metal of the bearings, the wheel bolt pattern, and the axle capacity. I have included a link...
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  • Wiring Harness for 1996 Cadillac Fleetwood Brougham Hearse for Use with LED Trailer Lighting
  • We offer TowReady Circuit Protected Modulite with 4 Pole Harness # 119179KIT for your 1996 Cadillac Fleetwood Brougham Hearse. This hard-wire converter includes a circuit tester to assist you in identifying the vehicle wires to connect. This converter will safeguard itself and the tow vehicle against harmful electrical shorts and mis-wire situations. It will work with LED trailer lighting. I have linked the written instructions as well as an installation video.
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  • prodigy Brake Controller Shows Dot, Locks Trailer Brakes After Breakaway Activates Trailer Brakes
  • It sounds like there may be a short on the blue wire. With the trailer connected to the tow vehicle use a circuit tester such as # 3808 to test the blue wire behind the controller. If it shows power then disconnect the trailer. If it still shows power, sever the blue wire from the back of the controller and test the end coming out of the controller. If it still shows power at idle and not just when using the manual override then there is an internal problem and the controller will need...
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  • What to Do with 12 Volt Circuit when Adapting US 7-Way Trailer Connector to European 7-Way
  • If the European 7-Way trailer connector does not have a 12 volt circuit (which it shouldn't) then you will not have to do anything with that circuit on the vehicle side. When you add a US style 7-Way to the bike rack that circuit will just dead end at the connector. If there is a loose 12 volt circuit wire then you can just use a wire nut or electrical tape and just cap it off and stow it out of the way.
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  • Convert a 4-way to a 7-way on a 2006 Lexus RX400 H
  • If the trailer doesn't have brakes all you would need is the 4 to 7-way adapter part # 37185. The 4-way of your 2006 Lexus RX 400h will plug into it and you would be ready to go. If your trailer has brakes you would instead need the part # ETBC7 and a brake controller. 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. I attached installation instructions...
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  • Trailer Wiring Harness Malfunction on 2011 Kia Sorento
  • The 2011 Kia Sorento comes in quite a number of versions (EX, LX and SX both with and without the factory tow package). The correct harness for your Sorento will depend on which particular version you have. The link provided will take you to our main page for all wiring harnesses and you can use the drop-down menu at the top of the page to choose your particular vehicle style. The first harness shown, Curt # 56146KIT, is a hard-wired type that installs through splicing into your vehicle...
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  • Troubleshooting Trailer Lights That Stopped Working After Bulb Replacement
  • There is no difference between the red and amber colored trailer lights. They are the same lights with a different color lens on them. If all of the lights on your trailer went out I would suspect you blew a fuse somehow in the process of replacing the light. I would check the fuse box of the vehicle you connected this trailer to looking for the trailer wiring fuses and replace as necessary. I attached an FAQ on trailer wiring as well as troubleshooting 4-way installs that should be...
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  • Troubleshooting Trailer Lights that Go Off When Headlights are On and Brake Is Applied
  • It sounds like you have a ground issue. When the headlights are on and the brakes applied, the highest amperage draw is placed on the wiring system and, a faulty ground will show at this time. Make sure you have good metal to metal contact. Paint and corrosion can act as insulators, so make sure the grounds of the light assemblies are touching clean metal. I would check all of the ground connections on the trailer. First, check the ground at the trailer tongue from the trailer conenctor....
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  • How to Determine Correct Trailer Wiring Harness for 2013 Mercedes GLK 350
  • Currently the 2013 or 2014 Mercedes GLK 350 hasn't been tested for what the correct wiring harness would be. I spoke with my contact and he said it's one of 2 harnesses, and told me how you could determine which would be the correct one. You will need a circuit tester like our part # 3808 for this. You will need to pull your taillights off of your vehicle and test the wires going to them. If one wire carries all 3 turn signal functions (stop, turn, and tail) then you would want the Curt...
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  • Trailer Wiring Recommendation for a 2014 BMW X5 with LED Taillights
  • Yes, the Tow Ready wiring harness part # 119190KIT that you referenced would work well on your 2014 BMW X5 with LED taillights. This harness is designed to fit vehicles with LED and incandescent bulbs. I attached an install video as well as installation instructions for you to check out.
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  • Why Don't They Make Trailer-Side Trailer Wiring Connector Covers
  • Covers aren't available for the male side of the round 4-ways like the part # PK11409 because a cover would hold moisture in which would cause corrosion. The vehicle side of trailer connectors often will have covers, but this is due to the fact that the connector is on a vehicle that will get driven in rainy conditions and otherwise would pick up road grime when not in use. When a trailer side connector isn't in use it is because the trailer is parked therefore a cover wouldn't be needed.
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  • How Would the Curt Wiring Harness part # 56200 Install on a 2013 GLK 250
  • We haven't had the chance to install the Curt Wiring Harness part # 56200 on a 2013 Mercedes GLK 250 so I do not know the correct color wires you would need to use. However, I attached a video that shows exactly what you will need to do to determine which wires to use. Basically you will test the wires of the taillight assemblies of your vehicle with the included circuit tester and then you will connect the correct wires of the converter to them according to the instructions.
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  • Replacing 6-Way Square Connector on Jayco Trailer and Using Adapter # 30104
  • The Jayco 6-Way square connector is unique to those trailers and # 37995 wouldn't be a good fit for adapter # 30104. But, it you were to order # 37995 any way you could use it by replacing the 6-Way end on # 30104 with the vehicle side 6-Way that comes with # 37995.
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  • Utility Trailer Lights Work when Vehicle is Off But Stop Working When Vehicle is On and Running
  • There could be a problem inside the vehicle or trailer side connector. You will need to make sure that each is clean and corrosion free inside and out. If your vehicle has a 12 volt circuit at the trailer connector that is only one when the truck is on, and it is shorting out due to corrosion, that could be the cause of the problem. It could also be a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then...
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  • Does the 12 Volt Power Wire on Adapter # 30717 have to be Connected for Lights to Work
  • If the lights on the trailer are connected to the 12 volt circuit on the 7-Way traielr connector then yes, you will need to have the black wire from adapter # 30717 connected. But if you are talking about the regular trailer lights then the likely issue is a bad ground. The white wire with the ring terminal has to be grounded to the vehicle frame for the adapter to work. Find a clean bare meatal surface to attach the ground. If you do need the 12 volt circuit live then you will need...
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  • Adapting a 7-Way on a 2003 Chevy Silverado to a 6-Way Round Trailer Connector on Big Tex Trailer
  • If your 2003 Chevy Silverado has a 7-Way connector I recommend keeping the 7-Way that you have # 50-67-005, and using it to replace the 6-Way on the trailer. A 6-Way is not nearly as common as a 7-Way blade style connector. You just have to determine the functions of the wires on the trailer and wire them to the new 7-Way accordingly. The functions on the 7-Way should be as follows: White Wire = Ground Red Wire = Left Turn and Brake Brown Wire = Right Turn and Brake Green Wire...
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  • Trailer Wiring Recommendations for a 2006 Hummer H3
  • If your Hummer H3 has the factory tow package wiring, most do, the Replacement Multi-Tow 7-Way and 4-Way Trailer Connectors for Ford, GM Trucks with Factory 7 Way, item # 30955, will connect to a round connector found above the rear spare tire. This connector will supply 4-Way and a 7-Way trailer wiring at the rear of your Hummer. If you do not have the factory tow package wiring on your vehicle, you will need to use the 4-Pole Hardwire Kit Including Circuit Tester, item # 18252, that...
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  • Left Side Trailer Tail Lights Won't Work, Right Side Goes Out with Brakes on 2007 Chevy Silverado
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. 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...
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  • How to Wire a Trailer so that Second Trailer Could Be Towed Behind It
  • The correct part you would need would be the 4-Pole Wiring Harness part # 118603. You would need to use quick splices like part # 804C to connect the wires of this harness to the correct wires of your travel trailer taillight wiring. The brown wires will run to the running light circuit, the green to the right stop/turn, the yellow to left stop/turn and the white to the ground circuit of the trailer. This will give you all of the taillight signals on a 4-way that you would need for...
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  • Wiring Harness Recommendation for an Audi Q7 with 5-Way Flat Connector
  • I recommend installing the Tow Ready Modulite Power Converter Kit with 5-Way Flat Connector, # 119177KIT. This harness has the standard 5-way flat connector for your surge brake lockout circuit and it uses a powered converter to protect the electrical system on your Audi Q7. This harness will work with LED or incandescent lights and it comes with all of the hardware and wire necessary to complete the installation. I have attached a link to the installation instructions. Keep in mind,...
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  • Trailer Wiring Harness for 1999 Chrysler Cirrus
  • We offer two universal-fit trailer wiring harnesses for your son's 1999 Cirrus; both can be seen on the link provided. These two harnesses that you referenced, the Curt # C56175 and the Tow Ready # 119178KIT, both do include a converter. This simply means that the harnesses adapt a 3 wire system on the towing Chrysler Cirrus to a 2 wire system on the trailer. I suggest the Curt harness # C56175 since it offers slightly higher current capacity and is the lower-priced option. The linked...
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  • Trailer Brake Controller Works with Manual Override but Not with Brake Pedal
  • Since the controller is activating the trailer brakes when you use the manual override that means that the trailer battery not being connected is not the problem. Both the brake pedal and the manual override will tell the controller to send back power on the same wire so that battery is not the problem. Although you should have it connected for safety. When a controller works with the manual override but not the brake pedal that indicates a problem on the red wire. The red wire is the...
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  • Availability of 9-Pole Round-Pin Trailer Connectors
  • We do offer 9-pole round-pin trailer connectors, both the vehicle side # PK12907 and the trailer side # PK12906, both from Pollak. These are covered by a 1-Year limited warranty.
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  • Trailer Turn Signals Only Work with Brake Pedal Pressed On 2012 Kia Sportage EX
  • If the trailer has LED tail lights the turn signals may not be drawing enough power to work properly. The solution would be to install load resistors, # P230004A-2, on the left and right turn signal wires. Since the brake lights offer more continuous power draw it makes sense that the turn signals or flashers would then start working because turn signals and brake lights are on the same circuit on trailers. If the trailer does not have LED tail lights then there could be a poor ground...
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  • Will the Curt Custom Fit Vehicle Wiring Harness # 56146KIT Fit my 2010 Mercedes-Benz ML350
  • Hello! The Curt Custom Fit Vehicle Wiring Harness, # 56146KIT, has not been confirmed or tested to fit a 2010 Mercedes-Benz ML350 so we can not guarantee that it will work for you. The best option that I have is the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT. This wiring harness is compatible with numerous different electrical systems and can handle LED, low voltage, multiplex, Pulse Width Modulation, and two wire or three wire...
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  • Electric Brakes Stop Working During Hard Braking on a Triple Axle Toy Hauler
  • It sounds like there is a short to ground somewhere. I would guess the short is on the trailer, especially if this is a new problem. The OL code indicates an overload and the SH code indicates a short on the electric brake output wire. The first step is to inspect the trailer wiring as much as possible between the connector on the trailer and the brake assemblies. Look for any pinched, frayed or damaged sections of wire that could be touching the frame. Since the brakes were recently...
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  • Troubleshooting Right Turn Circuit on Boat Trailer Pulled by 2012 Honda Pilot
  • On the Hopkins # 47345 adapter, the 'TM' lamp is for the running light circuit. To troubleshoot, use a circuit tester like part # 40376 on the trailer connector on the vehicle. Test each pin while the right turn/ brake, left turn/ brake and running light circuits are activated. If all circuits are testing properly, then the wiring problem is on your trailer. Begin at the trailer connector itself. If it's dirty, corroded or damaged in any way, you'd might want to go ahead and replace...
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  • Adding 4-Pole Trailer Connector to 2009 GMC Sierra Equipped with Factory 7-Way Connector
  • There's a few different ways you can do this. For the easiest choice, you can use a simple adapter like # PK12716. Simply plug it into the 7-way then plug the 4-pole connector for the trailer into the adapter. Another option would use the # 118384 4-pole connector. This 4-pole would plug inline between the vehicle wiring harness and the twist-in # PK11916 7-way. This would provide you with an always functioning 4-pole connector, and you wouldn't need to fool with an adapter.
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  • Solution for Backup Sensor Alerts on a 2014 BMW X5 When Carrying a Bike Rack
  • Yes it would, your 2014 BMW X5 will disable the backup alert system when it senses a trailer connected to the trailer wiring. So the load resistors in the 7-Way to 5-Way and 4-Way Trailer Adapter # TR20141 that you referenced would trick the vehicle into thinking a trailer is connected and and the sensors would not activate because of the brake controller. Another trick that people use with your vehicle is to tape over the sensors with masking tape.
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  • Trailer Wiring Harness Recommendation for a 2011 Malibu LTZ
  • Yes, the Tow Ready Wiring Harness part # 119179KIT that you referenced is confirmed to fit your 2011 Chevy Malibu LTZ. I attached installation instructions and an install video for this product for you to check out as well. The video shows a typical installation, the wire colors will be different for your vehicle.
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  • Trailer Wiring Harness Availability for a 2008 Lexus RX400h
  • Some vehicle manufacturers will run tow package wiring on the vehicles, but they will not include a trailer wiring harness if the vehicle is not ordered or purchased with the tow package. There is no aftermarket plug-in style trailer wiring harness for the 2008 Lexus RX400h. This may be a dealer only item if it exists. At this time, the only aftermarket wiring harnesses available for your vehicle are hard wire kits with a powered converter like part # 119190KIT. If you would prefer...
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  • Is there an Adapter to Go from a 4-Way Round Connector to a 6-Way Round Connector to Flat Tow
  • We do have a 4-Way round adapter but it goes to a 4-Way flat, # 47465. You could cut off the 4-Way flat end and wire in a 6-Way, # PK11609 for the vehicle end or # PK11604 for the trailer end, however your flat towing set up is arranged. We also have coiled kit # RM-164 which will allow you to replace the 6-Way end on the vehicle with a 4-Way round.
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  • Trailer Lights Not Working when Headlights are Turned On On a 2013 Ford Edge
  • There is one sure way to determine if the factory trailer wiring harness on your 2013 Ford Edge is pushing back enough power. You will need a multimeter such as # BTMT15. Have someone sit in the vehicle and go through the light functions while testing for amperage. You would also need to determine how many amps each light draws. Then with some simple math you can figure out if the trailer is drawing too much power to power the lights when the running lights are on. An easier way to...
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  • Trailer Wiring Harness for 2008 Audi Q7
  • If your 2008 Audi Q7 did not come with a trailer connector from the factory you can use the Curt universal-fit wiring harness # C56200KIT which is shown in the linked video being installed in an Audi Q5. The written instructions are also linked. Installation will be the same no matter where the battery is. Installation of this or any wiring harness will be simplified by use of a circuit tester such as # 40376 or # 3808 to confirm the function carried by each vehicle wire before making...
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  • Trailer Wiring Harness for a 2007 Kia Sedona
  • Even though you ordered a hardwire harness # 56146KIT it would still work on your 2007 Kia Sedona. You would just have to use a circuit tester, included with the kit, to test the tail light wires, and then attach the wiring harness wires accordingly. But there are T-connector wiring harnesses for your vehicle. You could use # 118410 which plugs in line with the vehicle tail light wiring. To testing required. But you will need to make a direct connection to the vehicle battery. This...
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  • Troubleshooting Trailer Blinkers Where When One is Activated the Other Blinks Dimly
  • We had this exact same problem in our shop the other day and the problem turned out to be that the grounds of the trailer light assemblies weren't sufficient. By grounding the light assemblies better the problem went away. You can also check to make sure that the main ground strap from the trailer connector that runs to the trailer frame is connected properly. If that does not fix the problem you can run the grounds from the assemblies straight to the main ground wire of the trailer...
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  • How to Secure the Tow Ready Wiring Harness to the Underside of a 2001 Lexus RX 300
  • The 4-Flat Universal Mounting Bracket # 118149 that you referenced would be an excellent bracket to use to secure the 4-way of the Tow Ready Wiring harness part # 118245 to your 2001 Lexus RX300. What I would recommend you use to secure the wires would be zip ties. You would just want to zip tie the wire harness to the underside of your vehicle avoiding moving parts that could pinch the wire and exhaust components that could melt it.
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  • Can Spectro 4-Pole 12-Inch Car and Trailer End Loop # 9653P Be Used as a Wiring Harness Extension
  • The Spectro 4-Pole 12-Inch Car and Trailer End Loop # 9653P is a perfect solution for cases where trailer wiring is just a bit too short. We also offer a 4-foot # HM47115 from Hopkins.
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  • Testing Brake Magnets
  • I have attached a helpful article that explains how you can test your brake magnets to see if they need to be replaced. The article explains how you can perform 4 different tests to see if your magnets are working properly. You can use a digital multimeter like part # BTMT15, to make sure you are getting the correct amperage. Many times the cost of replacing the entire brake assembly is not much more than replacing the components such as the magnets.
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  • How to Use Quick Splice Connectors or 3M Scotchloks and Wiring Harness for 2014 Dodge ProMaster 3500
  • To use the quick splice connectors you will put the wire you want to splice into on the inside track of the connector. Then put the wire from the wiring harness # C56190 in the track next to it. Close the plastic clip and use some pliers to squeeze the connector to make the splice. I have included a link to a video that shows our installer using the connectors. Go to about the 56 second mark to see it in action. Be sure to test the wires first with a circuit tester such as # 3808. This...
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  • Location of Wiring Harness on 2009 Lexus RX 350
  • We have fitted trailer wiring harnesses on the 2nd Generation Lexus RX 350. Assuming the 3rd Generation Lexus 350 is similar, you will have to remove several interior panels in the rear storage compartment to access the vehicle’s taillight wiring harness connector. See the diagram I made which shows the vehicle’s taillight wiring harness connector's location, and the linked video on how to remove the panels. You will then plug in the T-One Vehicle Wiring Harness # 118478. This will give...
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  • Troubleshooting Right Stop/Turn Circuit Not Functioning on Trailer
  • First place I would check is the ground of the light assembly in question. If the assembly is not grounded properly it will not function properly. Some assemblies ground through the mounting hardware, you will want to make sure the assembly is attached to a clean metal surface. The next thing to check would be the trailer connectors for dirt or corrosion and clean as necessary. Usually this will be on the inside of the connector on the vehicle, but corrosion can be on the back of either...
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  • Parts Needed to Convert a 4-Way to a 7-Way
  • I have a better solution for you than that. If your trailer does not have trailer brakes all you would need is an Adapter 4 Pole to 7 Pole and 4 Pole # 37185. You would just plug your 4-way into the 4-way of the adapter and you would have a functioning 7-way. You would want to tape the rest of the wires up and out of the way. If your trailer has brakes you would instead need the Universal Installation Kit for Trailer Brake Controller # ETBC7. I attached installation instructions and...
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  • Is the Arcon Replacement RV Power Cord Plug w/ Folding Handle # AR18203 Rated for Outdoor Use
  • The Arcon Replacement RV Power Cord Plug w/ Folding Handle # AR18203 that you referenced is rated for use on an RV so yes, it can be used outside and is rated for that.
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  • Trailer Connector has 4 Pins But 5 Wires
  • I am a little confused as to were the connector is, on the truck or on the trailer. Brown wires are typically associated with running lights. If there are 2 wires coming out of that pin and we are talking about the trailer side then you have what is called a wishbone harness. It will still function exactly the same as a regular 4-wire 4-Way connector. It just has 2 running light wires to run to the 2 sides of the trailer to limit the amount of splicing you have to do. If we are talking...
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