Faulty Trailer Lights
Thread Starter
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Diesel Fan
Joined: Jul 2007
Posts: 24
Likes: 0
From: CT
The problem is.....I can not locate a relay. The fuse block has all fuses-10amps to one 40amp. This is my next quest.
Uncle bubba, I would never hold anything against someone willing to take their time to help me when asked.
Thank you
Uncle bubba, I would never hold anything against someone willing to take their time to help me when asked.
Thank you
BOMBARDIER
Joined: Mar 2007
Posts: 12,854
Likes: 1,112
From: Illinois?
From what I have found it doesn't look like your gonna have a relay. It's all controlled by the main switch to the rear of the truck.
Doin some lookin through parts books here and it looks like the factory harness for your truck plugs right in under the rear end, should be nothin comin from the front of the truck to control just the trailer. A replacement factory harness is only about 3 feet long. It's all fed from the truck wiring to the rear. So if you have no power to the back of the truck you have a problem in the truck lights. In the end this tells me that you probably have a grounding problem and just need to clean all the grounds off and smear some di-electric grease on them. I also keep the terminals filled up with this grease to keep them from corroding myself. Wish I could offer more help here.
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Diesel Fan
Joined: Jul 2007
Posts: 24
Likes: 0
From: CT
No, the promlem is in the fuse box. The trailer fuse blew about a month ago. That fuse was replaced and the lights never functioned correctly after that. The wiring from the trailer plug all the way up to the fuse box is in tact and grounded.
I took the apart the fuse box and I believe the computer board inside was damaged when the fuse blew. I thought the fuse would have prevented this from happening. I will take the truck to the dealer this week.
Many thanks to you and uncle bubba for the help, it is much appreciated.
I took the apart the fuse box and I believe the computer board inside was damaged when the fuse blew. I thought the fuse would have prevented this from happening. I will take the truck to the dealer this week.
Many thanks to you and uncle bubba for the help, it is much appreciated.
Bombardier
Joined: Mar 2007
Posts: 9,655
Likes: 607
From: Da' Dirty South
just thinking outside of the box here and my post is not to make anyone feel stupid cause i've made mistakes too when checking stuff...... just going back to the basics....
BOMBARDIER
Joined: Mar 2007
Posts: 12,854
Likes: 1,112
From: Illinois?
dumb question again but did you test the plugs with the brake pedal pressed? if the brake pedal isn't pressed then there will be no power to the plug. if there is no power there after the pedal is pressed then i'd look into the brake switch under the dash that turns the brake lights on. have you changed the fuse that you replaced with another good one? i've seen some fuses look good and be bad before.
just thinking outside of the box here and my post is not to make anyone feel stupid cause i've made mistakes too when checking stuff...... just going back to the basics....
just thinking outside of the box here and my post is not to make anyone feel stupid cause i've made mistakes too when checking stuff...... just going back to the basics....
