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Trailer Light Problems - Won't work with van lights on

Discussion in 'Beginner Electronics' started by [email protected], Nov 14, 2007.

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  1. Guest

    I have a 4x8 trailer hooked to my Honda Odyssey. They are connected to
    each other using a 4 pin connector. The problem I'm having is when the
    van lights are "on" then the trailer lights will not work at all.
    However, when the van lights are "off" the trailer lights will work.
    If I put the hazards on, with the van lights off, all the trailer
    lights work, so I know the bulbs and connections work. The turn
    signals and brake lights also work if the van lights are off.

    I've read lots of places that say double check the ground so to test I
    disconnected the ground and the lights still worked when the van
    lights were off. I tried wrapping another ground to the van connector
    ground and connected it to the trailer hitch but just couldn't get the
    trailer lights to come on when the van lights were on. I even bought a
    new connector and light and tested with those with no luck. Any ideas
    or suggestions are appreciated.
  2. PeterD

    PeterD Guest

    bad ground, 100%.
  3. cadman

    cadman Guest

    Its either bad ground or you have the wires swapped around somewhere.

    The classic ground fault usually shows up as tail ight or brake light
    flashing at same time as indicators.
    The light is being grounded back through the brake light and/or tail
    light cct.

    I would go back to basics and use a multimeter to find which wire does
    which on the van.
    Then power up the trailer lights from a PSU and determine which wire
    is which on the trailer.

    You then need to check the grounds.
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