No trailer lights?

Discussion in 'Trucks and Trailers' started by lawnspecialties, Oct 22, 2006.

  1. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Posts: 2,513

    This morning when I leave the house, I see my trailer lights aren't working. The brake's lights work but not the "driving" lights. I sort of play with the wiring harness to see if there's a loose connection but nothing. Both harnesses look perfect. Possibly a short somewhere? The truck's lights are fine.

    This is a one year old trailer. Anything I'm possibly overlooking before I go crawling underneath looking for a broken connection? If there's a short, wouldn't that blow the fuse in the truck? :confused:
     
  2. FearThisDeere

    FearThisDeere LawnSite Bronze Member
    Posts: 1,168

    Do your trailer lights ground through the ball? Do you have a flat 4 wiring or a round 7?
     
  3. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Posts: 2,513

    These are on my 7'x14' single axle. It's just a flat 4 prong connector (no brakes or anything like that). I would imagine they ground through the ball.

    If that could be my problem, would the brake lights still be able to work? I'm working the fire station today and it's about a 25 minute drive. I would have thought the ball would have "cleaned" off enough in that time to get a good ground. I never saw the amber clearance light on the fender come on the entire trip. Tomorrow when I head out I'm certainly going to keep an eye on it.:confused:
     
  4. mike lane lawn care

    mike lane lawn care LawnSite Bronze Member
    Posts: 1,707

    had this problem, it was the ground on the truck. check that out and see if there is a broken wire somewhere,
     
  5. Rons Rightway Lawncare

    Rons Rightway Lawncare LawnSite Bronze Member
    Posts: 1,163

    Another thing to look at.... Check the fuse box in the truck very carefully for blown fuses. My 2005 silverado has fuses just for the trailers lights - 2 or 3 fuses - and I had problems with lights that wouldn't work and I could not find the problem till I decided to " just check " the fuse box and sure enough a blown fuse!
     
  6. YellowDogSVC

    YellowDogSVC LawnSite Gold Member
    from TX
    Posts: 3,759

    there may be a fuse box under hood (my 2005 f350 has one). Those larger fuses are separate from dash fuses and will affect trailers. Check your trailer ground and the ground on the lights at trailer. May be a loose nut if they ground through the stud on trailer lights.
     
  7. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Posts: 2,513

    That's what I'm wondering (and hoping). Thanks Ron and YellowDog. If I figure it out, I'll let ya'll know what it was.
     
  8. DBL

    DBL LawnSite Silver Member
    Posts: 2,219

    the absolute simplest check would be is the connecter in the right way or all the way in
     
  9. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Posts: 2,513

    Thanks again for the help everyone. Sure enough, fuse number 10 by the passenger side kickpanel fusebox Trailer Tow Parklamp Relay. Who'd have thunk it?:confused:
     
  10. FearThisDeere

    FearThisDeere LawnSite Bronze Member
    Posts: 1,168

    Glad to hear it was any easy fix. Trailer electrical can be a PITA.
     

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