Trailer Wiring Harness (4 Wire)

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Jan 22, 2008 | 07:16 PM

D2KStang

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Trailer Wiring Harness (4 Wire)

I was working on my truck when the four wire harness just fell on the floor. I know that sounds crazy but it was pieced together from a previous owner. I am now towing with the truck every once in a while and need trailer lights. I was wondering if anyone had a wiring diagram to show where the 4 wires on the new pigtail need to go. This is on a 1976 F150. THanks

Jan 22, 2008 | 07:24 PM

Mil1ion

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Right where the harness meets the end of the frame and bumper bracket there is a place to splice in the wiring.

You find both TS wires,Running light/License plate wire and Ground

Does this trailer connector have the Green/yellow/white/brown wires ?

Your Trailer Plug:

Brown is Running lights

Yellow = LH T/S Light

Green = RH T/S Light

White is for ground

Your truck wiring:

Brown is running lights

Yellow/Black = LH T/S Light

Green = RH T/S light

Last edited by Mil1ion; Jan 22, 2008 at 07:30 PM.

Jan 22, 2008 | 08:37 PM

D2KStang

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Yes it is green, yellow, brown and white. When looking at my truck I have the three wires you are talking about and that is how I wired it, so do I just need to ground the white to my chassis or is there a ground wire accessbile on the truck. Thanks

Jan 22, 2008 | 09:10 PM

Mil1ion

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Wire Ground wire from trailer passes through to ground wire attached to frame.

Jan 31, 2008 | 08:53 PM

tomcasino

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From: Saint Paul, MN

It's always a good idea to solder and shrink wrap any wires that are exposed to the elements as opposed to crimp terminals. This will last much longer and save some headaches in the future.

Feb 1, 2008 | 12:20 AM

FordTrucksKickGM

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I bought some handy 'T' connectors that plug into the wiring harness. No splicing and straight forward. Milion has a pic of what they look like.

Feb 1, 2008 | 11:02 AM

tomcasino

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From: Saint Paul, MN

Where can I get one of those T-connectors? I have been looking for one of those for years. They only sell them for late model trucks. At least where I've been looking that's all that I can find. I know what they look like, I just can't find on for my '76.