Trailer brake lights
Thread Starter
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Tuned
Joined: Mar 2007
Posts: 254
Likes: 0
From: Sacramento Ca
Trailer brake lights
Hello All;
I am chasing an electrical gremlin all over my truck. I have a 1997 250HD with a 460, used for towing. The problem I am having is with brake lights. I have brake lights on the truck but I do not have a right (passenger side) light on the trailer. I have determined the problem is not in the trailer, it is in the truck. I have been testing the truck starting at the plug with no sucess. The one pole on the truck is dead. Looking at the wiring harness, I have two harnesses in the same loom running back to the rear of the truck, one for the truck and one for the trailer plug. As I stated earlyer, the truck lights are fine, just the trailer lights are problematic.
Any ideas on where to look next would be greatly appreciated.
Thanks.
I am chasing an electrical gremlin all over my truck. I have a 1997 250HD with a 460, used for towing. The problem I am having is with brake lights. I have brake lights on the truck but I do not have a right (passenger side) light on the trailer. I have determined the problem is not in the trailer, it is in the truck. I have been testing the truck starting at the plug with no sucess. The one pole on the truck is dead. Looking at the wiring harness, I have two harnesses in the same loom running back to the rear of the truck, one for the truck and one for the trailer plug. As I stated earlyer, the truck lights are fine, just the trailer lights are problematic.
Any ideas on where to look next would be greatly appreciated.
Thanks.
Junior User
Joined: Jun 2007
Posts: 97
Likes: 0
From: Oakville, Wa
Your truck probably has a factory tow package with trailer circuits seperated from the truck circuits. There should be a seperate fuse box for the trailer and various other things located under the hood on the drivers side about 10" in front of the firewall. It is approx. 6" wide and 9" long. Find the blown fuse and you will be good to go! 
Posting Guru
Joined: Aug 2005
Posts: 1,036
Likes: 1
From: NE Ga
There's not gonna be one fuse for just one tailight. If it's a blown fuse, you would have zero power going to the trailer plug. Sounds alot like a bad ground somewhere. So I assume you hooked your trailer up to some other vehicle and it worked fine? Check the ground right at the plug on your bumper and then look for any possible corrosion in the system...wires that have been rubbed through or stressed.
More Turbo
Joined: Aug 2006
Posts: 576
Likes: 6
From: midland, Ontario
Power distribution box under hood fuse #6 Trailer right hand stop/turn lamp. 10 amp fuse.
You did not say whether you have a right brake lamp working or not. I would assume not.
If so check this fuse.
You did not say whether you have a right brake lamp working or not. I would assume not.
If so check this fuse.
Thread Starter
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Tuned
Joined: Mar 2007
Posts: 254
Likes: 0
From: Sacramento Ca
Thanks for the advise all. I found the #6 fuse was burnt. I am hoping that this solves the problem. I have changed the fuses but have not hooked back up to the trailer.
Greatly apprecate the help.
Greatly apprecate the help.
