I have a 94 Sierra - rear lights- (blinkers/reverse) not working/cutting out when brake applied. have checked fuses & changed bulbs
after using my flashers/hazards - im having rear light issues...blinkers blink super fast (replaced bulbs & fuse is fine), if left blinker on, when brake applied right one blinks, or all lights cut out when brake applied, no reverse lights...but have parking lights (until brake applied then cuts out). I do most of my own maintainence on truck but have never had to deal with electrical and am at a loss - any ideas?
The only other time I have seen this is when led lights where used in place of the regular light. It causes some sort of back feed. Make certain you have the factory light for each socket. Aside from that..... I would look at the multi function switch and just wiring.
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