Trailer brake hook-up
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Freshman User
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From: Redstick LA.
Trailer brake hook-up
I have electric brakes on a trailer and need to hook them up to a 7 pin.
There is a red and black wire what do they do and where in the 7 pin plug do they go? thanks
There is a red and black wire what do they do and where in the 7 pin plug do they go? thanks
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From: Virginia
To operate trailer brakes you need a brake controller mounted under the dash. Do you have one? Also if you take the plug apart, it should be labeled what wire goes where, so you can pull anybody's trailer(left, right, tail, stop, ground, etc.)
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Freshman User
Joined: Aug 2004
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From: Redstick LA.
Yes I have a brake controllerit is a Draw Tite. I also wanted to know what the red and black wires did. Is one a power and the other a switch or solenoid to activate the brakes?
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Joined: Sep 2004
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You can go to www.Pirate4X4.com/tech/billavista/towing and it has a colored diagram of the circuitry and the wires' location on each style of trailer connector.
It also has wiring diagrams and color codes for brake controller wiring on various makes of trucks and SUV's.
I hope that is of some measure of help to you!
It also has wiring diagrams and color codes for brake controller wiring on various makes of trucks and SUV's.
I hope that is of some measure of help to you!
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Joined: Jan 2001
Posts: 56,971
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From: Virginia
Someone probably wired this thing up, so you will have to figure it out. Normally you have a left turn/brake wire, right turn/brake wire, running light wire, a ground wire, and the trailer brake wire. Sometimes people add extra hot wires to charge batteries and run 12 volt lights in their trailers.
The trailer brake wire should come right out of the brake controller. See if the controller has a red wire coming out of it that looks like the mystery wire in the rear. You can also put a test light or meter on the red wire in the rear, and manually activate the controller to see if you have voltage back there.
I haven't a clue about the black wire. The only suggestion I have is to trace it out a little bit. If it is going way up the frame, I would be suspicious it might be a hot wire, and you might find it over near the starter relay or battery +. Hopefully you have some circuit breakers or fuses in some of these add-ons.
The trailer brake wire should come right out of the brake controller. See if the controller has a red wire coming out of it that looks like the mystery wire in the rear. You can also put a test light or meter on the red wire in the rear, and manually activate the controller to see if you have voltage back there.
I haven't a clue about the black wire. The only suggestion I have is to trace it out a little bit. If it is going way up the frame, I would be suspicious it might be a hot wire, and you might find it over near the starter relay or battery +. Hopefully you have some circuit breakers or fuses in some of these add-ons.
