Select Your Vehicle
view cartView Cart



Filter Questions and Answers:


reset filter

Expert Answers about Wiring


  • Availability of Trailer Wiring Harness for 2015 Lexus RX350 F Sport
  • The hitch manufacturers have not yet completed testing to determine if trailer wiring harnesses from the 2014 model carries over and will work with your 2015 RX 350. If the connector is located on the driver's side frame member near the bumper and the connector is compatible with the plug of the # 56083 as shown in the photo I provided, it's likely that the # 56083 trailer wiring harness would be compatible. However, I cannot provide any guarantee, as Curt hasn't approved it as a fit. If...
    view full answer...

  • Finding and Repairing Poor Ground Connection on Trailer
  • What you're describing is the classic symptom of a poor ground connection somewhere in the trailer wiring on the vehicle or on the trailer. Everything works fine until you draw maximum amperage through the system by turning on the running lights. Check the ground connection on the vehicle where the trailer connector attaches to the vehicle frame or chassis. Make sure this connection is tight and not corroded. Trace the white wire from the trailer connector back onto the trailer tongue,...
    view full answer...

  • Troubleshooting Curt Trailer Wiring Harness Install on a 2000 Nissan Xterra
  • The red wire of the Wiring Harness part # 56146KIT that you referenced should be run to the brake light circuit of your 2000 Nissan Xterra. If you are missing that connection I would recommend you verify that the other wires are securely connected to the correct circuits. Especially the black wire that needs to run to the positive terminal of your vehicle battery. If this connection isn't made, or the fuse isn't installed in the fuse holder the converter will not work. I attached an...
    view full answer...

  • Could a 7-pin European Connector be Adapted to a Nato 12 Pin Trailer Connector
  • I am sure there is a way to do it. We don't carry either style of connector though so I wouldn't have any parts I could recommend. You would need to track down the two connectors you would need. One that would plug into the your Range Rover and then one that would plug into your 12 pin Nato connection. You would need to also get wiring diagrams for both plugs and wire them by function to each other. I attached a couple pictures that should be helpful
    view full answer...

  • How to Wire a New 4-Way to a Sea Doo Trailer that Has Double Wires
  • Sounds like you need to redo the wiring of the new 4-way completely. Typically, the green wire runs to the right turn/stop circuit, the yellow runs to the left turn/stop circuit, the brown wire runs to the taillights and the white is the ground that runs to the trailer frame. If you have double wires or, "wishbone wires," on your trailer but the new connector only has single wires you will want to either twist the double wires together, or use a butt-end connector to run both of the...
    view full answer...

  • Adapter to Go from 6-Way Square on Tow Vehicle to 4-Way Flat Trailer Side Connector
  • It sound like you want the opposite of adapter # 30104. That would mean your tow vehicle has a 6-Way square connector. What you can do is use # 37995 which has both the vehicle end and trailer ends. On the trailer end, you can wire the loose wires to a vehicle side 4-Way, # HM48190. Then you will have a 6-Way square to 4-Way flat adapter. The other option is to just replace the 4-Way flat on the trailer with the trailer end 6-Way that comes with # 37995.
    view full answer...

  • No Brake Light Function on 6-Way Round Trailer Connector on Chevy Motor Home
  • It sounds like there is a blown stop light fuse on the Chevy motor home. Use the owners manual or the legends on the power distribution box lid/in-cab fuse panel to locate any and all tow package wiring fuses so you can check them. If that is not the problem it is possible that the 6-Way on the motor home has separate brake light and turn signal circuits. You would need to test the other pins to determine if any of them carry a brake light signal. If there are separate circuits for...
    view full answer...

  • Does Computer have to be Flashed After Replacing Factory Brake Controller On 2008 Ford F-350
  • The factory integrated brake controllers, especially the first generations of them, performed poorly as you have described. They are just not designed well and thus not effective. On newer trucks they have gotten better but I would still say an aftermarket controller is superior. When you install an aftermarket controller in your 2008 Ford F-350 the factory controller will have to be disconnected. This will cause a fault code to appear. That fault code will have to be cleared by your...
    view full answer...

  • Tekonsha P3 Controller Stays On with Bulb-Out Sensor Adapter Installed
  • The same reason the part # C57003 prevents your P3 # 90195 from falling asleep would be the same reason the # 20142 would do the same. Both of these adapters have resistors installed on the circuits. The only solution I could make for you would be to remove the # C57003 from your vehicle when not in use. Also, the LED display of your brake controller puts such a miniscule amount of draw on your vehicle that it would take weeks before it would adversely affect your battery life.
    view full answer...

  • Trailer Wiring Diagram for 1975 Blair Tandem Axle Stock Trailer
  • The linked article on trailer wiring will give you diagrams and specifics about wiring a trailer with a light kit such as # 432800 from Peterson. We also offer install kits like # HM51020 that can help simplify the process of re-wiring.
    view full answer...

  • Adapting a 6-Way Square Jayco Trailer Connector to 7-Way on Vehicle
  • The easiest thing to do would be to replace the 6-Way square on the Jayco trailer with a 7-Way, # PK12706. You can adapt the 6-Way Jayco to the 7-Way on your vehicle. But it will take a little bit of work. First, you will need 6-Pole Square Trailer Wiring Connector Kit # 37995 because the Jayco square plug doesn't fit any other 6-Way square. This part has both the vehicle end and the trailer end which will both be needed. Then you will need a trailer side 7-Way such as # PK12706....
    view full answer...

  • What Gauge Wires Should be Used with the Hopkins Connector part # HM48480
  • There really isn't a set maximum gauge wire that could be used on the Hopkins Connector part # HM48480. Most people will use 10 gauge wire as the max gauge for the brake output, 12 volt accessory, and ground wires. So you could easily use that gauge or slightly smaller or bigger without a problem.
    view full answer...

  • 7-Way to 4-Way Round Adapter Recommendation for Trailer Lights on a Camper
  • Yes, the Hopkins Endurance Flex-Coil Trailer Connector Adapter # HM47043 is exactly what you need to plug into the 4-way round you have on your Palomino slide-in camper and then to the 7-way on your truck. This will power the taillights of your camper.
    view full answer...

  • Adding Electric Brakes to Second Axle of Tandem Axle Carson Trailer
  • You can certainly install brake assemblies and drums on the rear axle of your tandem axle trailer, and they'll bolt right up as long as the axle has a brake mounting flange installed on it. If the rear axle uses the same bearings, and the hubs have the same wheel bolt pattern, you can use the same # 23-469 and # 23-468 brake assemblies and # 84556UC3 hubs you used last time.
    view full answer...

  • How to Find the Stoplight Circuit on a 2013 GMC Terrain for Brake Controller Installation
  • Use a circuit tester like part # 3808 on the wire in the # 11 terminal on the black BCM connector, as shown in the diagram I provided. The wire colors can vary during a production run, which is why we typically recommend that folks wire by function, not by wire color. As an alternate method, you can use a fuse tap like part # F2526 on the CHMSL (center high mounted stop lamp) fuse in the fuse box. The lid of the fuse box should have a legend that will tell you which fuse location is needed.
    view full answer...

  • 7-way and 4-way Install Harness Recommendation for a 2005 Chevy Silverado
  • If the 7-way on your 2005 is a twist-in style connector then yes, the Hopkins Endurance Multi-Tow Twist-Mount 7-Way RV and 4-Way Flat Trailer Connector # HM40920 that you referenced would work as a replacement that would give you a 7-way and a 4-way. If it's not a twist-in style you could use the part # 30955.
    view full answer...

  • How to Find the Reverse Light Circuit on a Vehicle
  • That information I do not have, but I can help you determine which wire it is. You will need to use a circuit tester like our part # 3808 to test all of the wires going to the reverse lights. Which ever one has voltage only when the reverse lights are on is the one you are looking for.
    view full answer...

  • Installation Instructions for the Tow Ready Wiring Harness part # 119178KIT
  • I attached a link to the right that has the installation instructions for the Tow Ready Wiring Harness part # 119178KIT you referenced. I also attached an install video that shows this harness being installed on a similar Saturn as yours. Your local hardware store should be able to set you up with a self-tapping screw to use for the ground wire as well.
    view full answer...

  • Installation Instructions for 4 Pole Harness Kit # 119179KIT on 2014 Subaru Impreza
  • I have attached the installation instructions for the Upgraded Circuit Protected Modulite with 4 Pole Harness and Hardwire Kit, # 119179KIT. You will see the link off to the right. As for an installation video, I have attached one that will go through the basic steps on how to test wires, where to connect the wires, and routing. Please keep in mind that the installation for the 2014 Subaru Impreza won't be exactly like the one on the video since that was on a different vehicle but this...
    view full answer...

  • Where to Find the 12 Volt Power Wire for 7-Way Wiring on a 2012 Ford Expedition
  • Actually the color wire you are looking for to power the 12 volt power circuit of the 7-way adapter part # 37185 is orange in color and will be right near where you found the blue wire for the brake controller. See the picture I attached plus the FAQ link to the right that details how to install a brake controller in an Expedition like yours. The other solution you have would be to run a 10 gauge wire like part # 10-1-1 (sold by the foot) through a 40 amp breaker like part # PK54540...
    view full answer...

  • Powering Third Brake Light on a 1985 Scamper Truck Bed Pop-Up Camper
  • The wire that attaches to the red wire on a brake controller is a dedicated brake light only wire so it could work. But I would not use it for a light and a brake controller at the same time since it is not meant to have the extra draw on it. Another option is to take a combined circuit with brake light and turn signal and use a converter such as # 118158. The output side would provide a red, brake light only wire. I have had customers tell me that you would need both the green and...
    view full answer...

  • Parts Needed to Install a 7-Way on a 2015 Subaru Outback Wagon
  • If you are looking for a way to 7-way trailer wiring on your 2015 Subaru Outback Wagon you will first need to start with a 4-way. For that you will want the part # C56040. (see install video). Now if your trailer doesn't have brakes all you would need to convert this to a 7-way would be the part # 37185. If you do need a 7-way because your trailer has trailer brakes you would instead need the part # ETBC7. This comes with a length of loom. For a brake controller I would recommend...
    view full answer...

  • 4 Way Wiring Kit for 2013 Harley Davidson Electra Glide Ultra Limited
  • Although we do not have a plug and play wiring option for your 2013 Harley Davidson Electra Glide Ultra Limited, I have a solution for you. You could use the Upgraded Circuit Protected Taillight Converter with 4 Pole End, # 119178KIT, on your Harley. Since motorcycles have separate turn and stop lights, this wiring harness will convert this separate system to the common combined system on most trailers. To install part # 119178KIT, you will need to start by testing the wires on your...
    view full answer...

  • Wiring 12 Volt Power to Leer Camper Shell on a 2013 Chevy Silverado
  • You have a couple of options to get 12 volt power to the camper on your 2013 Chevy Silverado. First, if the truck has a functioning 7-Way trailer connector you can tap into the 12 volt power wire behind the 7-Way. The 12 volt circuit is in the 11 oclock position if looking at the back of the 7-Way. The other option is to get the power direct from the battery. I have included a link to a help article that explains where the 12 volt connection is made to the battery for the trailer connector....
    view full answer...

  • Why Would a Right Trailer Taillight Stay on After Vehicle is Turned Off
  • Typically when a trailer function stays on after the vehicle has turned of the problem is a fried aftermarket 4-way converter box. Or, if the lights are LEDs sometimes you will see the lights dimly lit. If you have an aftermarket 4-way converter box installed for trailer wiring on your vehicle most likely it has shorted out. Check out the video I attached that details how to test it. These don't usually short out for no reason, before you replace the harness you will want to find...
    view full answer...

  • Getting 12 Volt Power to 7-Way Trailer Connector on a 2003 GMC Sierra
  • To get the 12 volt circuit working on the 7-Way trailer connector on your 2003 GMC Sierra you will first need to go under the hood and remove the covers on the power distribution box. After removing the main cover and the cover under that you will see a post on the passenger's side front corner. There will need to be a 40 amp fuse in the nearest location to that post. If there is no wire attached to that post then you will need to follow the help article I have linked to the right. Step...
    view full answer...

  • Trailer Wiring Recommendation for a 2013 VW Passat TDI SEL
  • Although it hasn't been confirmed to fit you 2013 Volkswagen Passat TDI we were able to install a Curt Wiring harness part # C56201KIT on a 2013 VW Passat and it worked just fine. I attached the install video that you referenced that shows this. Since it hasn't been confirmed by Curt all we can say is that it should work for you. The # C56201KIT is a universal kit that can adapt to most configurations.
    view full answer...

  • Right Turn Signal Not Working on 7-Way After Installing 4 to 7-Way Adapter # 30717
  • Since the brake lights and turn signals are combined on the same circuit, one for each side (3 oclock and 9 oclock pins) the right turn signal not working on the 7-Way is a little strange but not without precedent. It is likely a ground issue. Make sure that the white ground wire on adapter # 30717 is attached to a clean and corrosion free bare metal surface. Also, make sure the vehicle side 4-Way is clean and free of corrosion as well. Since the turn signal functions on the 4-Way...
    view full answer...

  • 6-Way Round to 7-Way Flat Adapter Recommendation
  • The # 47435 that you referenced would be exactly what you would need. This will plug into the 6-way round on your tow vehicle and will give you a 7-way connector for your trailer to plug into.
    view full answer...

  • Trailer Wiring Harness Option For a 2009 Volkswagen Jetta SportWagen
  • The best trailer wiring harness option for your 2009 Volkswagen Jetta SportWagen is the Tow Ready Heavy-Duty Modulite Harness Kit, # 119190KIT. This is a splice-in harness and I have attached an installation video of this harness on a 2012 Volkswagen Jetta to give you an idea of what is involved with the installation. I'm sorry, but there are no plug-in style trailer wiring harnesses available for the Jetta SportWagen. We carry all of the major trailer wiring harness manufacturers and...
    view full answer...

  • Troubleshooting Brake Controller Making Noise And Causing Brake Lights To Blink
  • To help troubleshoot your brake controller, I have attached a helpful article that explains some of the common problems that can occur with a brake controller along with some methods that can be used to correct them. I recommend using a circuit tester like part # 3808. For a hard wire installation you will want to test each of the wires and make certain they are installed properly. Any connections that are not secured properly can cause a number of problems. It is equally important...
    view full answer...

  • What is the Difference Between Hopkins # HM47365 and Pollak # PK12716 Wiring Adapters
  • Both the Hopkins # HM47365 and Pollak # PK12716 wiring adapters allow a tow vehicle with a 7-way blade-style trailer socket to connect to a trailer that is equipped with a 4-pole flat connector. Both plug in to the socket on the vehicle and provide a receptacle for a 4-pole flat trailer connector. The difference between them is that the Pollak adapter is a single piece while the Hopkins adapter uses two separate sections linked by a short length of wiring. In some applications these...
    view full answer...

  • Installing 7-Way Trailer Connector on 1999 Explorer w/ 12-Volt Power Circuit for Trailer Battery
  • To install a 7-way trailer connector on your Explorer, you'd first need a functioning 4-pole. If you don't have a 4-pole, you can install one using part # 118345. At this point, you'll need to decide if you need the 7-way to provide the lighting and battery circuits only to the trailer, or if you need to install a brake controller on the Explorer as well. If you just need the lighting and battery feed circuit, you can use an adapter like part # 37185. The adapter would plug into your...
    view full answer...

  • Determining Functions of Wires on a Boat Trailer to Install a 4-Way Flat Connector
  • Since there is no standard for wire colors and functions you will have to determine the function of each wire on the boat trailer. There are two ways to do this, you can trace each wire back to see where they all terminate. Or you can apply 12 volt power to each wire and see what lights up. On a Trailer side replacement 4-Way, such as # 18004, the one covered pin is the ground (white is most common). Next to that is running lights (usually brown). Then you have left turn and brake lights...
    view full answer...

  • Adapter Recommendation to Connect 30 Amp System to a 50 Amp RV System
  • The Arcon RV Power Cord Adapter # AR14368 that you referenced will connect to a 30 amp male plug and then the other side will connect to a 50 amp female plug. If you need the opposite configuration you would want the part # AR14372. Based on your question I believe this is the adapter you need. See review video.
    view full answer...

  • 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...
    view full answer...

  • Recommended 7-Pole Connector Compatible with Curt T-Connector Vehicle Wiring Harness
  • Yes, the Curt 4 Pole to 7 Pole Adapter, part # C57674, that you referenced is a confirmed fit with the Curt T-Connector Harness with 4-Pole Flat Trailer Connector, # C56040. You will plug the adapter into your existing 4-way. If you want to use the other functions you will need to hardwire the remaining four wires. Here's how. The White wire with the ring terminal is the ground. The Black wire is the 12-volt power wire and goes to the positive battery terminal via a 40 amp circuit breaker....
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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....
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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,...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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...
    view full answer...

  • 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....
    view full answer...

  • 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...
    view full answer...




Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email






etrailer.com reviewsetrailer.com reviews

All images, layout and content copyright etrailer.com