1. Missed the live Ask the Expert event?
    Not to worry. Check out the archived thread of the Q&A with Ken Hutcheson, President of U.S. Lawns, and the LawnSite community on the Franchising Forum.

    Dismiss Notice

Trailer lights wiring help please

Discussion in 'Trucks and Trailers' started by crousehouse4, Mar 8, 2010.

  1. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,151

    The trailer end that plugs into the truck will have a white wire about 2 ft long. Bolt that to a ground on the trailer.
     
  2. ALC-GregH

    ALC-GregH LawnSite Fanatic
    from PA
    Posts: 7,053

    then make sure the white wire on the vehicle is grounded to the chassis somewhere. Doing this will allow the lights to work without the coupler/ball connected. Even though I have no clue why the lights would need to work if the trailer is disconnected.

    Also for future reference, green is right and yellow is left. Brown is park/running lights.
     
  3. brucec32

    brucec32 LawnSite Platinum Member
    Posts: 4,403

    Trailer attached to the CAR? This thread really needs pics.
     
  4. Larson Lawn Care

    Larson Lawn Care LawnSite Senior Member
    Posts: 738

    Every year for the past 5 years I've had to replace the wires and/or lights on my trailer. I had no clue why the lights would stop working on me. I just bought the new LED lights with a wiring kit today and re-wired everything and replaced the lights. Only one light was working. So I took the light over to the other side (the side that was working) and checked to make sure I didn't get a defective light, and it worked. It took me a while but I figured out that it wasn't getting a good ground. So I cleaned the hole where the bolt goes and whata ya know it worked. Hopefully no more annual re-wiring... I'll check the ground first if anything goes wrong in the future. I also checked my fuses and the fuse for the light that didn't work was blown. It still didn't work after I replaced it until I found out it was the ground wire that was the problem. So my advice is to check the fuses and figure out the ground problem.
     
  5. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,151

    Well Mr Larson ya still did the right thing. It takes about 10 min to run new wiring as opposed to possibly hrs fixing nicked wires. I run a new set every couple of yrs.
     
  6. ALC-GregH

    ALC-GregH LawnSite Fanatic
    from PA
    Posts: 7,053

    common ground is the leading cause of faulty lights on trailers. ALWAYS make sure you have a good ground to the trailer and the light fixtures are grounded well too.

    I worked at a U-Haul center for 13 years. They are the worst for getting lights to work as they use the hitch to ground the trailer. I can't even begin to tell you how many ground wires I had to run to trailers from vehicles just to get the lights to work. Then the hundreds of trailers I built from scratch and wired up.
     
  7. ALC-GregH

    ALC-GregH LawnSite Fanatic
    from PA
    Posts: 7,053

    Correction, I worked at a "dealer" for 13 years. We were a authorized repair shop for U-Haul. I was the guy you'd see laying on his back under a U-Haul truck sitting on the side of the road in the rain with water running in my pants leg and out my armpit. Man I hated dealing with break downs. The only thing that kept me doing them was the pay. $35hr from the time I left my house to the time I got home. Most breakdowns were 3-4hrs each. 2-3 a week and I had another paycheck! :D

    Ever try to replace a exhaust manifold on a 1990 E-350 with a big block 460 in it? If ever asked to do it, PASS. Biggest PITA ever.
     

Share This Page