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Trailer Brake Jumper Harness Wire Connection questios

This is a discussion on Trailer Brake Jumper Harness Wire Connection questios within the Electrical forums, Tweet Just bought a 2012 Tundra with the tow package. I am about to install the trailer brake jumper harness ...

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    Metalman is offline New Breed
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    Trailer Brake Jumper Harness Wire Connection questios



    Just bought a 2012 Tundra with the tow package. I am about to install the trailer brake jumper harness and brake controller. I can match four wires between the harness and the controller. However, the harness has an extra wire, colored green. The instructions on the trailer brake jumper harness reads, "GREEN: HEADLAMP SWITCH TO VEHICLE TRAIL LAMPS". I assume trail is tail, but what's it for and where does it go, since I have tail lights at the trailer wire sockets under the rear bumper?

    I read on one of the posts that I should provide a body ground under the dash for the trailer brake circuit. I will tap into the ground wire and make a connection to the ground screw.

    Also, there must be a directional/brake light module somewhere on the truck to allow trailers without separate amber directional lights to work. Just in case it fails sometime, does anyone know where it's located?

    Thanks


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    Toxarch's Avatar
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    This should help:
    http://www.toyotatundraforum.com/tow...er-wiring.html

    There's one wire that is not used, and that is the green wire. I believe that is for dimming the trailer brake controller light when the headlights are on.
    Not sure what you are asking about for the directional module.
    Any questions about truck mods I have done need to be asked in the forums. Don't send me a private message about mods cause I probably won't answer that PM unless there is money involved.

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    Metalman is offline New Breed
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    Thanks for the reply. I will button up the kick panel and leave the green wire coiled near the plug.

    Since the truck has amber rear directional signals and most trailers do not, there must be a module somewhere in the trailer wiring circuit on the truck that combines the truck's directional light circuit with the brake light circuit, so the brake lights on the trailer can be used as directional lights. I wonder where the module is located, because they sometimes fail. If I'm out on the road and it fails, I'd like to be able to repair it without taking the truck to a Toyota dealer.

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    Aren't all 4 pin trailer plugs wired like that? The same wire for stop and turn on each side. I don't think I've ever seen one go out on a truck. Most are wired straight to the taillight wiring.
    Any questions about truck mods I have done need to be asked in the forums. Don't send me a private message about mods cause I probably won't answer that PM unless there is money involved.

    2007 SR5 Crewmax 5.7L 4x4
    Mods: nerf bars, Truxedo tonneau, radar detector power, 3M clear bra, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, CDT 6.5" speakers, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Nitto Terra Grapplers LT305/55/20, OME HD coilover lift, Firestone helper air bags, 55w reverse lights, stereo cable lock, Tekonsha P3 brake controller, colormatched exterior parts (de-chromed truck), Weathertech floor mats, eDead sound proofing, CDT Audio speakers, Custom made speaker brackets, LED foot well lights, PRG/Deaver 3 leaf mini-pack, LED map lights, Air Lift WirelessAir system, Bed LED Lights
    All mod descriptions and pictures 2007-2014 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

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    warsw is offline Special Breed Bow Hunter Champion
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    Quote Originally Posted by Metalman View Post
    Thanks for the reply. I will button up the kick panel and leave the green wire coiled near the plug.

    Since the truck has amber rear directional signals and most trailers do not, there must be a module somewhere in the trailer wiring circuit on the truck that combines the truck's directional light circuit with the brake light circuit, so the brake lights on the trailer can be used as directional lights. I wonder where the module is located, because they sometimes fail. If I'm out on the road and it fails, I'd like to be able to repair it without taking the truck to a Toyota dealer.
    Good question, I was wondering the same thing. Since Toyota has separate lights for turn signals from brake lights I had to buy a module and wire it into the circuit on all the other Toyota P.Us I have owned (Tacoma) but on the Tundra it was taken care of. I'm curious where and how they did it.
    Travel at my own pace, turn where I want to turn, with no one to answer to but me. "Freedom"!

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    TRD rear sway bar


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    Metalman is offline New Breed
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    Over the years I have dealt with the amber directional light / trailer problem on an RV, and several motorcycles. Each required either adding amber turn signals to the trailer or installing a module. Modules can be purchased from U-Haul, motorcycle suppliers, and of course auto parts stores. I suspect the Tundra has one build into the trailer light circuit, but I didn't see anything under the back end of the truck.

    I wonder if anyone has a set of Tundra electrical schematic diagrams on a PDF file?

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    tundra20104x4 is offline Special Breed
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    My trailer lights work perfect with my truck. Brakes,turns,and flashers. Even when I put in reverse it turns my brakes off in reverse for backing up.


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