Re: trailer tow wiring for electric brake controler
There is a box in the footwell on the drivers side mounted to the firewall. It is above and to the left of the brake pedal. It will have a cover on it with a long black plastic nut holding the cover on. Remove that cover, and your pigtail will plug into there.
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most aftermarket electric controllers have 4 leads, a hot 12volt, ground, a wire that goes to the trailer brakes, and another wire tied into the brake lights. There should be instructions included with your controller. I put one on my 96 dodge ram 2500 4x4.
I would recommend taking out the tail light. Get a test light, have an assantant step on brake. U will see the bulb in tailamp light up. Probe the wire w/your test lamp. That is brake wire. Repeat that process for blinker.. Drop down those two wires. Hook that to the same side on trailor. Repeat for left and you should be all set.
Your truck may have had the factory trailer tow package, but that did
not come with a wiring connector in that year. There should be a wire
harness under the rear of the truck near the center of the bumper with 7
wires of the following colors/characteristics -
Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Tail Markers (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
Violet/Black - Backup Lights (Thin Wire)
Dark Green/Red - Left Stop/Turn - (Thin Wire)
Brown/Red - Right Stop/Turn - (Thin Wire)
Black - Ground - (Thick Wire)
Under the dash, the brake controller wiring should be -
Alot of these trucks have the wiring hook up under the dash or at rear bumper area where you can just plug the wire harness from controler to it, but if not they are simple to wire and then you must level by following the instructions,you would wire it to power and ground then one wire to brake switch and the last wire goes to tow connector for electric brake on the trailer. for more help google how to install brake controller there you will find wiring diagrams and videos.
Id say your pig tail to the trailor is having high resistance or a wire is cracked, Follow the pigtail under bumper, It plugs into main harness, Disconnect and look for damage or a dry white powder. If everything else works as you say? And your positive the vehical being toweds lighting works on another vehical? than the pig tail is bad, replace at any local parts store
I believe you can look up the manufacturer of the trailer plug kit and find the wiring diagram there. On alot of the trailer plug kits, they have pics and diagrams in the package. The 7 pin plug (truck side) is available with the pig tail set up that plugs directly into the wiring harness for the lights. Then all you would have to worry about is the 2 wires for the electric brakes.
I take it the blinkers and brake lights work ok when not hooked up to the trailer? If yes, then the wiring to the tow hitch is not hooked up correctly. How many wires to trailer pig tail connection? U can have up to 7 depending on what you tow. Check to make sure these wires are hooked up from the truck to tow plug correctly: 7 wired--- brown-Rt turn and brake light, yellow-backup, white-ground, blue-electric brake, green-tail running lights, black-battery charger, red-left turn signal and brake light. Let me know if u have something other than 7 wire, I'll get the wiring color and source info for u.