GMC sierra 1500 '96 blinkers and brake lights will not work
I have a GMC pickup and the blinkers and brake lights magically stopped working,, The 4 ways work and so does everything else, not gettin any turn signals in the dash either,, all fuses are good and also i replaced the flasher what i have narrowed it down to is that i have to put in a turn signal switch and a brake switch but i am not sure,, and help would be awesom..
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There is a tail lights fuse for the truck, but not for the trailer.
First, check that your left tail light on the truck is working, if not fix the problem (new bulb, bad contact, fuse).
Then the obvious suggestions regarding the trailer are: Check the tail light portion of the bulb to be sure it is not blown. If good (best to put in new one to be sure), then check the wiring from the front of the trailer all of the way to the non working bulb, including every connection and at any place it is secured to the trailer frame. If all is good with the trailer circuit and bulb, then check the truck's trailer connector, including any adapters. If by chance the truck is wired with a flat 4 wire harness the problem may be solved (but usually the blinkers are the problem). Modern trucks require a 5 wire harness which self adapts to the standard 4 wire trailer circuit. Check for dc power (12 volts) from the truck's female connector. One wire will be ground, others will be taillights (turn on headlights), brake lights (have someone press brake pedal), and blinkers (turn on switch and blinkers).
First, verify that the brake lights work correctly with the old lights. If your blinkers work, the brake lights should work as well.
It is possible that your brake lights were not working previously. If they do not work, suspect a blown fuse or a defective brake light switch.
I have notice that this is a common problem. The socket most of the time goes bad, I don't know why but they just do. You can pick them up at any parts store for around 5.00 each. If you don't have a volt meter and ground straps to test it right, then I would try changing the sockets out. Quick and easy. Let us know how it goes.
I had similar problem with my 97 sierra... I only lost 1 light, then brake lights stayed on all the time... turns out the "t" connector for the trailer harness under rear bumper was rotted inside...unplugged the 2 parts of the harness and pluged them into each other with out the "T" harness.... everything works great... Hope it helps ya