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trailer ground issues

Discussion in 'Trucks [ Eighteen Wheelers ]' started by pval2571, Mar 15, 2010.

  1. Mar 15, 2010 #1
    pval2571

    pval2571 Bobtail Member

    12
    2
    May 21, 2009
    Clarence, NY
    0
    I am having an electrical problem that is literally keeping me awake tonight. I have a second 4 wire plug on my wagon to power 2 dump valves, strobes, and backup lights. if i unplug the 7 way, all the things on the other plug stop working. shouldn't they ground thru the 5th wheel? also, none of my extra stuff works at all if i turn on the trailer lights. not exactly sure where to start looking next. trailer is an 09 utility truck is 06 intl 9900
     
    pval2571, Mar 15, 2010
    pval2571, Mar 15, 2010
    #1
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  3. Mar 15, 2010 #2
    Les2

    Les2 Road Train Member

    5,150
    2,288
    Jul 25, 2008
    kicked back in my lazyboy...
    0
    Before you go tearing things apart, run a ground wire from the truck to the trailer first. Sometimes the 5th wheel will lose its ground to the trailer if you have a slickdisc or a lose 5th wheel.

    The top pin on your 7 plug should be the ground. It could've broke on either side truck/trailer.
     
    Les2, Mar 15, 2010
    Les2, Mar 15, 2010
    #2
  4. Mar 15, 2010 #3
    black_dog106

    black_dog106 Road Train Member

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    Mar 29, 2009
    MA
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    Just as Les2 said..... you have a ground problem? Dont count on fifth wheel for a ground. After saying that.... i also run a ground strap from the fifth wheel down to frame, just to make one more path. Ground is just as important(or even more so) as the "hot" wire.
     
    black_dog106, Mar 15, 2010
    black_dog106, Mar 15, 2010
    #3
  5. Mar 16, 2010 #4
    pval2571

    pval2571 Bobtail Member

    12
    2
    May 21, 2009
    Clarence, NY
    0
    ran a jumper to frame, all works right. def doesn't ground enough. i'm sure it has to do with the wiring at the rear that was "repaired". ordered a new harness, but won't have it for a week, trying to keep things working. right now all that is really screwed is the strobes and dump valves.
     
    pval2571, Mar 16, 2010
    pval2571, Mar 16, 2010
    #4
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