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  1. #1

    Default Trailer Wiring Diagrams Pinouts


    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  2. #2


    excellent graphics Cableguy! I can't think of much to add to that, except for maybe easy tap-in points for the turn signal lights. I'll get to that later though.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  3. #3


    Trailer Wiring Diagrams

    4 Way Systems

    Flat molded connectors allow basic hookup for three lighting functions; right turn signal, left turn signal, stoplight / marker and a ground.

    4 way tow vehicle side.
    4 way trailer side.

  4. #4


    5 Way Systems

    Same as 4 way system listed above but adds a extra red or black auxiliary power wire.
    5 way tow vehicle side.
    5 way trailer side.

  5. #5


    6 Way Systems

    Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights and electric brakes.

    6 way tow vehicle side.
    6 way trailer side.

  6. #6


    7 Way Systems

    Round 2" diameter connector allows additional pin for auxiliary power.

    7 way RV flat blade tow vehicle side.
    7 way RV flat blade trailer side.

  7. #7


    Hopefully thats all the wiring diagrams for different applications. Trailer, trailer brakes and vehicle. Although vehichle colours codes on vehicles can vary....Add on if ya got em. We appear to have lost original post about trailer wiring. Sorry for the inconveinence.
    Last edited by Cableguy; 05-09-2007 at 05:29 PM.

  8. #8


    This guys seems to have some handy tips on colour codes...Vehicle side. He's got some good tips too.

  9. #9


    Nice job cable guy. Now we don’t have to explain it ever again just post a link to this..

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

  10. #10


    Thanks Fiero. If you have something to add throw it in there. I can well imagine you've put a hitch or 2 on

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