Trailer Brake Wiring
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Junior User
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Trailer Brake Wiring
I was poking around under the dash the other day and noticed the trailer brake was plugged in to a fancy little add on plug under there (I did not do a lot of the upgrades on this truck) but then I also noticed some cut wires coming out of one of the trucks wire harness very near by and in the same colors as the wires of the brake controller. I did tape the ends off for safety but know I am wondering why there is a set of color coded wires and a plug (that it is attached to) with total different wires.
Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
This should describe all of the extra wires under there and in the engine compartment.
https://www.fleet.ford.com/truckbbas...nd_wiring.html
https://www.fleet.ford.com/truckbbas...nd_wiring.html
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
OK well that book isn't all that informative.
Basically, on that old of truck, there are 4 wires under the dash that go through the firewall to the engine compartment. You can use them for anything you want. There should also be the trailer brake connector, which you already know about, and the Auxiliary PCM connector. The APCM lets you get PTO and high idle functions.
I'm not sure on any other not connected wires on that old of a truck.
Basically, on that old of truck, there are 4 wires under the dash that go through the firewall to the engine compartment. You can use them for anything you want. There should also be the trailer brake connector, which you already know about, and the Auxiliary PCM connector. The APCM lets you get PTO and high idle functions.
I'm not sure on any other not connected wires on that old of a truck.
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