Trailer Wiring Info

[whiteknight]

I have a 96 with the factory tow package and back in November I noticed that the green continuity LED on my brake controller was on without the trailer. It would be fairly bright one time, dim the next or not on at all another. At about the same time I started having intermittent problems with the ABS light coming on too.



I could meter a high resistance ground on the blue brake wire. I checked all the usual, trailer plug and wire harness connector behind the rear bumper. I had already used dielectric grease in those and found that the problem was still there when the wires were disconnected. I found an electrical schematic for the factory trailer wire harness and discovered another wire harness connector located under the truck behind the left front wheel. There are two connectors and the one with the blue trailer brake wire going through it had water in it.



After cleaning one and checking the other I put dielectric grease in both and have had no further problems with either the trailer brake continuity light or the ABS light coming on.



Though this might help someone else.

 

[Jammar9082]

WhiteKnight: Where did you find the "electrical schematic for the factory trailer wire harness"? I am installing a Jordan brake controller and have spent the last two hours looking in the shop manual for information on the four lug trailer connector located under the dash to the left of the steering wheel. The "Electric Brake Provision" connector is referenced on page 8W-54-3 and -4 but the manual stops there. Do you have a page reference? Hope so!



Also... ... is the dielectric grease you used a high temperature Silicone?



Thanks.

 

[tgbol]

A number of years ago I was working as the night field mechanic for the City of Los Angeles. I went into a yard to check some trucks and found 15 of 21 trucks with blown fuse on the tail lights. When I checked them out I found that some one had painted the rea bumpers with that zinc loaded paint used on traffic signal poles. A little carb cleaner and di-electric grease did the trick. Flagged enough time for two days.