Having problems with your 1991 Chevrolet C1500 ?
I have a 90 chev 1/2ton the brake lamps are inop,i was towing a trailer and the turn and brake lamps became inop, checked fuses and found turnsignal fuse blown and the brake good,but the brake fuse was a 15amp and some one had installed a 30amp fuse, i replaced the turn signal fuse and the turn signals worked but still no brakes, so i checked the brake switch and found the connector and switch burnt, i replaced the switch and fixed the wiring at the switch still no brake lamps?
Use a test light and see if there is power to the switch. Then depress the pedal and you should have power on both sides. If there is no power to the switch, check the harness from the fuse box to the switch. If it got that hot, it may have melted the wire covering in the harness. You can use a jumper wire to the power side of the switch and try the brake pedal. You can get an inline fused wire and connect to the power side wire and see if it blows the fuse. That will tell you if the feed in wire is grounded. If there is power at the switch and goes through when you press the pedal down, look at the harness under the truck, especially around connections. Hope this helps. Mike
Repair Help & Product Troubleshooting for 1991 Chevrolet C1500
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