Trailer wiring help FAST PLEASE
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Senior User
Joined: Nov 2003
Posts: 167
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Trailer wiring help FAST PLEASE
I have a 97 expy and installed a 7 way plug some time back. I now have a enclosed trailer that needs a 12v constant source. In the factory harness that includes the electronic brake wire their is a orange wire that I was told was the one i needed but it has no power. The fuse under the hood is ok... WHATS THE DEAL?? PLEASE HELP, im leaving for a trip!!!!!!
Elder User
Joined: Jul 2003
Posts: 746
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From: Salisbury, MD
The center pin should be the constant power. If you have a test light or circuit tester try testing it to see if your getting any power to that point.
I believe the truck must be on "on" for the power.
If you can't figure it out get some 10 gauge wire and run a fresh wire from the battery with an inline 30 amp fuse.
I believe the truck must be on "on" for the power.
If you can't figure it out get some 10 gauge wire and run a fresh wire from the battery with an inline 30 amp fuse.
Last edited by daveplot; Jul 29, 2004 at 12:14 PM.
Senior User
Joined: Mar 2004
Posts: 219
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From: Grand Island, NY
The center will not work for electric brakes they will always be on, a Ford dealer should be able to get you a harness to connect the brake controller to a plug under the dash. Then the brake controller signal will go to pin 3 on the factory mounted 7 pin connector.
# Color Gage Circuit Function connector interior
1 Black or Red 10 12v
2 Green 14 Right turn
3 Blue 12 Electric Brake
4 White 10 Ground
5 Small Yellow 14 Left Turn
6 Brown 14 Running lights
7 Yellow 10 Auxiliary 12v
NOTE: #7 is the center terminal and currently is most commonly used for backup lights.
Wiring Code 7 way Trailer End # Color Gage Circuit Function connector interior
1 Black or Red 10 12v
2 Green 14 Right turn
3 Blue 12 Electric Brake
4 White 10 Ground
5 Small Yellow 14 Left Turn
6 Brown 14 Running lights
7 Yellow 10 Auxiliary 12v
# Color Gage Circuit Function connector interior
1 Black or Red 10 12v
2 Green 14 Right turn
3 Blue 12 Electric Brake
4 White 10 Ground
5 Small Yellow 14 Left Turn
6 Brown 14 Running lights
7 Yellow 10 Auxiliary 12v
NOTE: #7 is the center terminal and currently is most commonly used for backup lights.
Wiring Code 7 way Trailer End # Color Gage Circuit Function connector interior
1 Black or Red 10 12v
2 Green 14 Right turn
3 Blue 12 Electric Brake
4 White 10 Ground
5 Small Yellow 14 Left Turn
6 Brown 14 Running lights
7 Yellow 10 Auxiliary 12v
Tuned
Joined: Aug 2002
Posts: 263
Likes: 0
From: USA
The electric brake wire is blue, and if your X didn't have a factory trailer plug, just look where the main harness wires run, it plugs in somewhere around the spare tire. You'll see the blue wire doesn't come out. Just splic into it and you'll be fine.
As far as the battery charge wire. You'll be in the same situation as with the electric brakes, also it should only have power when the truck is on.
Consult your owners manual b/c there are 2 relays in the fuse box under the hood by the brake booster that need to be in place for either electric brakes or trailer battery charge wires to work.
As far as the battery charge wire. You'll be in the same situation as with the electric brakes, also it should only have power when the truck is on.
Consult your owners manual b/c there are 2 relays in the fuse box under the hood by the brake booster that need to be in place for either electric brakes or trailer battery charge wires to work.
