Wiring Assist Please...
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    Wiring Assist Please...

    Thanking anyone who could give me a hand installing a flat four-wire trailer wiring harness on a 2010 GTI. I am vaguely familiar with modulated wiring but am not having much luck finding the hardware I need to tie trailer lighting (taillights, turn signals, and brake) into my vehicle. The process looks simple enough (trace out wires at each rear light housing, tie into them, and source fused constant 12 volt from under hood). I have tried looking on this forum but have not found what I need, at least so far. Please help! Guess I only need brand name and model number of necessary part. If anyone has install tips/cautions, that also would be a great help. Thanks again!

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    Re: Wiring Assist Please...

    You do not use any BATTERY power, it's all lighting wires, and
    a 4-wire is not enough for how the lights are configured on these
    cars, because you have a separate brake and signal lamps, the four wire
    harness is not enough.

    All you have on the flat four wire is:
    Right Turn, Left Turn, Tail/Parking, and ground.

    The Turns are combination brake/turn, for cars that use the same light
    for turn signals and brake. They are ON solid at braking, but it will also
    blink for the appropriate turn signal. We have completely separate brake
    and signal lights.

    You need a five way, so you can add the brake lights.

    The five way has:
    Electric Brake, Right Turn, Left Turn, Tail/Parking, and ground.

    You're gonna use the wire for Electric Brake for the brake lights.

    The six-way has a wire for reverse lighting.

    Four wire, is not going to do you any good, you either use the two signal
    wires as brakes, and hope they can see your car's tails for signaling
    -or-
    You use them as signals and hope they can see your car's tails for braking

    Either way, will draw a ticket of a cop sees it.

    Plus, you still have nothing for reverse lights unless you use a 6-way.

    The only time you need AUX power is in a 7-way, for accessories inside an
    enclosed trailer.

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    Re: Wiring Assist Please...

    Wow!! Retired Master Electrician here...and an honest to goodness shadetree mechanic...I will spend some time digesting you answer (which is very much appreciated). At this point in time however, I am dazed and confused. The car is not mine; belongs to my son so cant run out and look but certainly will do so in the near future. I sure the good old days for cars!! Thanks a lot for taking the time to write.

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    Re: Wiring Assist Please...

    OK...I drew up what I assume the wiring looks like (six individual bulbs, one separate ground wire to all the bulbs, one separate feed to left turn, one separate feed to right turn, one separate feed to both tail lights, and one separate feed to both brake lights; five wires total). This seems to go along with what you are saying. Now...how is that five wire plug going to feed the trailer lights? The trailer has two bulbs; each with common internal filaments; which serve brake and taillight functions. Seems like I would need six separate bulbs on the trailer to make proper use of all five wires. What in the world am I missing? If you can respond, I would be much appreciative. Thanks again.

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    Re: Wiring Assist Please...

    With the dual filament single biub, it will be a little more involved
    with just the flat wire harnesses. You will need a wiring kit for the
    car, part# is given in the second video. I mean, you can with the
    flat connector, but you're gonna needs relays, and that's more
    wiring work...

    Here are some options:
    http://www.myturbodiesel.com/wiki/ho...ver-mk6-jetta/
    https://youtu.be/3oLOVbnNTLo
    https://youtu.be/FTVCcTjGjok

    The videos all have the kit, there is a universal kit.

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    Re: Wiring Assist Please...

    Thanks once again. I will know more when I can get a look at the vehicle (son is not in town as of this writing). I must admit this sure has been more work than I ever envisioned though. Given your last reply, I may very well need to run power from the cranking battery to power up this arrangement. Once I verify just how many bulbs are being used on the car, I can formulate a better game plan. The pulse width interface used in the videos may be the way to go. They are generally used when a single lamp utilizes two different voltages as I understand (6 volt for tail and 12 volt for brake/turn). I will write back when I know more. In the meantime I still cannot envision how a normal trailer can make use of a five wire flat connector (that you first mentioned we might be able to use). They just are not set up for that... four wire only. Talk to you soon.

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    Re: Wiring Assist Please...

    https://www.carid.com/2013-volkswage...-51181044.html

    All the adapter does, is takes your brake and signal wires (3) in, converts it to
    two (2) wires out, and it will automatically handle the brake and signaling.

    So, you use the 4-wire:
    Battery or Ignition Power to Module, & Ground for Module
    Ground to Harness Ground (WHITE), then to a ground on the Trailer, or to all grounds on the lights.
    Running Light to Harness (RED), then to Trailer Tail Lights, to Both LO-Filaments, and any other lighting, like plate lights.
    Left signal to Module, then output from Module Left to Harness (YELLOW) then to Trailer Left HI-Filament.
    Right Signal to Module, then output from Module Right to Harness (ORANGE) then to Trailer Right HI-Filament.
    One Brake wire to Module - The Rest is handled internally.

    Running lights will illuminate the LO filaments and any other lighting.
    Then, when you brake, both HI filament sides light up from the Module.
    When you signal, the appropriate side flashes from the Module.

    When you brake, and then turn a signal on, the module sees which side
    is blinking, then automatically flashes that side while keeping the other
    side on for brake.

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