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trailer light problem

Discussion in 'Trucks and Trailers' started by holycow72, Jul 19, 2007.

  1. holycow72

    holycow72 LawnSite Member
    Messages: 1

    I'm new to this forum...so bear with me, if this is an easy fix because I'm missing something...I've never wired a trailer before...

    Ok...rewiring trailer lights....new wire, new plugs, and new harness on vehicle...

    problem is when the vehicles headlights are ON....the trailer lights are lit, but when I hit the brakes...the trailer lights go out completely, rather than light the trailer brakelights

    if i have the vehicle lights OFF...the trailer brakelights work just fine on the trailer

    please help

  2. grassmanak

    grassmanak LawnSite Senior Member
    Messages: 792

    probably a ground problem, is your trailer on the ball when you try this, best way to ground the trailer is not with a ground wire but through the ball and hitch.
  3. SiteSolutions

    SiteSolutions LawnSite Bronze Member
    Messages: 1,114

    Send me some of that good 5h1t you're smokin

    Must be awesome. Maybe laced with something.
  4. gammon landscaping

    gammon landscaping LawnSite Senior Member
    Messages: 553

    never ground threw a hitch, run a wire, also when you are doing you wiring always have the trailer unhooked from truck this will keep alot of problems from happening. when you rewire do not use the trailer as a ground just run another wire. people using the trailer as a round is the number one reason for strange lighting problems
  5. grassmanak

    grassmanak LawnSite Senior Member
    Messages: 792

    i havent used a wire ever. I have 5 different trailers with lighting, never had a problem doing it this way. I take the wire from the truck side ground and ground it to the reciever hitch that way when the ball is on its grounded better.
  6. SiteSolutions

    SiteSolutions LawnSite Bronze Member
    Messages: 1,114

    Mmmmm... sounds like they dipped it in LSD
  7. crash935

    crash935 LawnSite Member
    Messages: 20

    You should never ground soley through the hitch, many times the hitch receiver is painted along with the hitch, rust and dirt build up in the hitch and you should have a light coating of grease on the hitch ball to reduce friction. All of those things will cause you to lose a good ground between the truck and trailer.

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