PLease clarify, this is a trailer hooked to a GMC Sierra then? Do the truck lites work?
SOURCE: Brake lights quit working.
if all fuses and bulbs are ok get to the brake switch and see ifits stiff or stuck, if it just has two wires on it you could join themtogether to see if the brake lights come on though obviuosly dont leave them joined.Good luck davelee
SOURCE: No brake lights, or no signal lights
brake lights and turn signals work off the same curcit, it could be the fuse or the brake light switch !!!!!!
SOURCE: trailer brake controller problem
I found the problem. Talking with a technician from the controller company, we determined that it was a fuse problem. I found that the fuse to the CHMSL was blown.
SOURCE: my trailer wiring on my 2001 gmc sierra
First replace the trailer light brake/turn signal fuses. I have seen where the fuse will show good, but loose connection in the block. You can easily do it by using the flashers. Using a test light you can check power in and out of the fuse. Just touch the tester to the metal pin on top of the fuse... on both sides. Power in and power out. If power is there on both sides and still nothing below the fuse box, the box is bad. Not a common problem. Also check http://www.etrailer.com/faq-wiring.aspx.
SOURCE: wiring diagram for 1996 gmc sierra brake asembly
The brake light switch is at fault. Get a new one and replace it. The location is at the brake pedal area mounted on a bracket with a plunger stud that rest on the brake pedal's arm the pad is attached to
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