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Expert Answers about Flat Tow Wiring Harness


  • Troubleshooting Dealer-Installed Wiring Harness on 2017 Jeep Wrangler
  • The types of wiring harnesses used for flat towing a vehicle behind a motorhome and for towing a trailer with the vehicle are different. If the dealer installed a standard trailer towing wiring harness this will not function correctly for flat towing the Wrangler behind the Sprinter. For reference I linked our main pages for both types of wiring kits for your 2017 Jeep Wrangler. But if the dealer installed a flat-towing type harness such as Hopkins # HM56200 it should make no difference...
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  • Custom 4-Flat Trailer Wiring Harness For A 2014 Jeep Wrangler
  • Absolutely, to add a 4-flat back to your 2014 Jeep Wrangler you'll just need the: -Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C55124. This harness will simply plug into your vehicles factory harness located behind the driver side taillight. It's also recommended that you use some Dielectric Grease for Electrical Connectors # 11755 on all of the electrical connections.
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  • Wobble Concerns Towing A Jeep
  • The "death wobble" sometimes happens when the vehicle is being flat towed. The 2017 Jeep Cherokee is one model where this applies. There is a special wiring harness needed for flat towing. The harness does something with the steering wheel lock and allows the Jeep to track without any sway or "death wobble" that can be potentially dangerous. The harness is designed to address the Jeep issued Service Bulletin which calls for a special wiring harness which keeps the electric power steering...
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  • Left Turn Signal Stopped Working on 2013 Subaru Impreza WRX Trailer Wiring Harness
  • Use a circuit tester like # PTW2993 to test the wires going into and coming out of the converter box. If the signals are not correct going in then there is an issue on the vehicle side such as a broken connection, loose wire, or blown turn signal fuse. If the signals are correct going into the box but not correct coming out, then the converter is bad, and it will need to be replaced. I have linked a video that should help. If you are in need of a new harness after testing it then I recommend...
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  • Running Lights on 2005 Toyota Avalon Not Working After Installing Trailer Wiring Harness # HM56100
  • The wiring harness that you referenced, Hopkins # HM56100, is not intended for use with a trailer. This harness is designed to operate the 2005 Toyota Avalon lights in flat-towing applications when using a tow bar behind a motor home. The correct trailer wiring harness for your car is Curt # C59236 which is a hard-wired installation that provides a flat-4-pole trailer connector to power your trailer lights. Written installation instructions as well as a video are linked at right.
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  • Correct Tekonsha T-One Wiring Harness Needed For 2022 Nissan Pathfinder Without Factory Tow Package
  • You need the T-One Vehicle Wiring Harness # TK58VR that includes the additional relay harness since your 2022 Nissan Pathfinder did not come with the factory tow package installed. This harness and relay we do not carry as a separate item.
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  • Should There Be Power Draw At Tail Lights For Flat Tow Wiring on a 2023 Chevy Suburban
  • According to the owner's manual for the 2023 Chevy Suburban, you'll need to disconnect the battery once it's in flat-tow mode. This should prevent any power draw on the battery while using the flat tow wiring. We like to recommend installing the Roadmaster Battery Disconnect with Switch # RM-766 for vehicles that require disconnecting the battery that way disconnecting the battery is as easy as pressing a button when it comes time to flat tow.
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  • Recommended Wiring Harness and Installation for 2008 Toyota Sienna with Tow Package
  • Sounds like your factory wiring harness was damaged and you are looking to replace it with a new wiring harness. TowReady T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118304 is the correct wiring harness for your 2008 Toyota Sienna. Take a look at the installation video that I have included which shows the installation of # 118304. The 4 pole connector is designed to hang out the bottom of your back cargo door. I can't say whether the harness will fit through the grommet...
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  • Troubleshooting Hopkins Plug-In Wiring Harness HM43125 In 2013 Honda Ridgeline That Keeps Gong Bad
  • I am sorry you have had issues with the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM43125 you have installed on your 2013 Honda Ridgeline. To make sure the harness stays in good working order for multiple years I recommend double checking that you are routing the harness in a way that it is not too close to the muffler that could cause the wiring to be damaged and cause the module to go bad. Do you tow just one trailer, or multiple trailers? If...
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  • Troubleshooting Trailer Wiring For Double Towing Camper and Motorcycle Trailer Behind 2016 Tundra
  • It sounds like you want to tow 2 trailers and need the wiring for both. It is completely possible to do that as long as your truck can handle the total weight of the two loaded trailers. For the wiring, there are a couple of different options. You can run an extremely long harness like you mentioned that will be a simple customized length or you can tap into your trailer wires to create a harness at the back of your camping trailer. My recommendation is to do the latter. To tap...
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  • Troubleshooting Tekonsha T-One Harness for Factory Tow Package Installation on 2018 Honda Pilot
  • Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118760 is a great harness. Since you say installation went well, the trailer main fuse may not be connected properly. If you are simply not getting function, check all the trailer connections and fuse locations again as outlined in the attached installation details. If all that checks out then go back to check the white ground wire to ensure it is bare metal to metal as even paint can cause...
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  • Constant Power On Curt Harness for 2019 Toyota Tacoma
  • If there is constant power on the trailer connector at any of the circuits while the vehicle is off, then this indicates the converter has gone bad and the entire wiring harness will need to be replaced. The best option we have for a 2019 Toyota Tacoma is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56349, so it just needs replaced.
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  • Troubleshooting The Quick Connections On The 2017 Ford Explorer And The Tekonsha Harness # 118272
  • This Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector # 118272 harness is designed to be used with vehicles that already have a factory tow package. If you don't have that factory tow package, it may not fit. If you don't have the tow package, I recommend you use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118540. If you do have the factory tow package, it should install to the connection located beneath the vehicle behind...
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  • Trailer Lights Come On But Brake and Turn Signals Do Not Work Using 4-Flat with 5-Flat Connector
  • You are correct in assuming that the light functions on the trailer should work when connecting the 4-flat connector from your 2002 Toyota Highlander to the 5-flat connector on your trailer as long as everything is wired correctly. If you are saying that the trailer lights come on when you plug the trailer connector to the vehicle connector and the brake or turn signals do not work, then it sounds like something is not wired correctly. I suggest using a circuit tester like part # PTW2993...
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  • Running Lights Stay On with Curt T-Connector Vehicle Wiring Harness On 2016 Honda CR-V
  • In order to troubleshoot the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56158 which is a fit for a 2016 Honda CR-V you'll need a test light. Once you have this you'll then need to probe the running light wire going into the converter box with the signal NOT active. If you have power here then you know the issue is on the vehicle. If you don't have power here then test the running light wire leaving the converter box. If you have power here then you...
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  • Troubleshooting Wiring Ground Connection From Towing Vehicle to Towed Vehicle Installation
  • The Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting # 154-792-118158 does need to be grounded to the vehicle chassis at both locations. Without a solid metal to metal ground, the converter and the trailer wiring may not function properly. It is possible they could work being tied together and connected into the towing vehicle ground through the 4-way wiring harness, but that is putting a lot of faith in your tow vehicle ground connection and the gauge...
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  • Reverse Lights Flash when Left Turn Signal is On Using Hopkins Tow Bar Wiring on 2015 Jeep Wrangler
  • This is the first time I have heard of this issue with any Hopkins tow bar wiring harness such as # HM56200 on a 2015 Jeep Wrangler Unlimited. Since this harness plugs in line with the tail light wiring there isn't a way that it could have been connected in the wrong spot. It is possible though that there is a bent pin or maybe corrosion that is causing a short to jump to the reverse light on that one side. That is the first thing I would check. Another thing that might cause the harness...
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  • Inocrrect Pinouts on Hopkins Plug-In Simple Vehicle Wiring Harness for 2011 Lexus LX 570
  • The Hopkins Plug-In Simple Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Flat Connectors part # HM11143910 is the only available plug-in seven way trailer wiring harness for a 2011 Lexus LX 570. I checked out some of the review and the few complaints that I saw were that the plugs appeared to be pinned incorrectly. There are two connectors on the drivers side and two connectors on the passenger side. The harness will plug into both sets of connectors but the connectors on...
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  • Which Trailer Wiring Harness is Correct for a 2018 Chevrolet Equinox LT
  • If you do not have the factory tow package on your 2018 Chevrolet Equinox LT then the correct trailer wiring harness for you is the T-One Vehicle Wiring Harness part # 118750, not the Curt Wiring Harness part # C94FR. The Curt Vehicle Wiring Harness part # C94FR is only for model equipped with the factory tow package. There will still be a plug for the latter harness but if you do not have the factory tow package then the circuits may not all be ran to the power distribution center (PDC)...
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  • Troubleshooting Flat-Towing Wiring Harness HM56203 for 2005 Jeep Liberty
  • First, make sure that all connectors for Hopkins 4-pole wiring harness # HM56203 are fully-seated together at the Liberty's tail lights and that the locking clips are engaged. Next, check the white ground wire to be certain it is tightly affixed to a clean bare metal spot on the car's metalwork. Sand off primer/paint and/or clean off any other material or contaminants that might prevent metal-to-metal contact. This ground wire is most often the cause for lighting issues like yours. You...
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