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learned something

Discussion in 'Trucks and Trailers' started by exmark72, May 29, 2006.

  1. exmark72

    exmark72 LawnSite Member
    Messages: 123

    i leaRNED SOMETHING NEW TODAY!!! what u may ask! while that in order for trailer lights to work the truck and trailer must be touching each other!!! who know??????
  2. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    Yep the trailer must be grounded to the truck through the wire harness or the hitch ball. If its a 4 way plug........the white wire is the ground and should be attactched to the trailer frame

  3. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    I always thought grounding through the ball was a dumb idea. But they do it.

    Don't 6, 7 and 9 pin harnesses have a ground on them?
  4. oldrustycars

    oldrustycars LawnSite Senior Member
    Messages: 301

    you should ALWAYS ground through the wiring, never through the ball. grease on the ball can interrupt the ground, trailer bouncing can interrupt the ground. the white wire in the plug is the ground.
  5. FearThisDeere

    FearThisDeere LawnSite Bronze Member
    Messages: 1,154

    All my trailer are grounded through the wiring. I used a Uhaul trailer once and it was grounded through the ball. Every bump would cause static on the radio. That was fun! Could have just been the wiring, but I don't really want to find out. Seems like better sense to groud it through the wiring. More reliable and less of a hassle. It is always good to learn things though!
  6. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    yes they have grounds also but not sure of what color the wire is for the ground . When I 1st started out towing trailers, I bought a bass boat and the dealer said that the trailer would ground through the ball ( I question why white wire was not attactched)With it grounded like that when I gave a signal the marker lights would blink and all sorts of weird things...........si I hooked up the white wire and poof no more problems

  7. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    Exactly correct, surprising how many people dont want to cover up that pretty chrome with grease or they dont want to get grease on there hands or clothes when making contact accidentally :laugh:

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