You have a "Hot Wire" some place that is shorting out. You need to start following the wires to see if you can find the short.
Remove the Brake Light assembly and start there, working your way forward. Good Luck and Remember.
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Remove bulbs and check sockets for short to ground Check wiring for short
I have a 1983 GMC Sierra it has no dash,tail lights an brake lights are very dim
Check stop light fuse Check bulbs double filamented smaller for brake lights Check the operation of the stop light switch Check socket for corrosion
Please re-phrase your question; it appears you are saying the brake lights come on when you push the brake pedal and the lights are working (normal operation). If the lights are staying on after you release the pedal, then the problem is with th brake light switch (sticking). Thanks Malcolm
Check the fuse for the brake lights. It should be marked stop/haz on the fuse box cover.
Check stop light switch at top area or brake pedal - maybe damaged when column broken
Brake Lights that Will Not Turn OffAlthough it's possible there could be other reasons, the most common causes for brake lights to stay on continuously include:The brake light [if mounting position is adjustable] is out of adjustment, orThe brake light switch contacts are fused ["welded"/melted] together, orThe brake light switch is otherwise defective.
98 sierra1500 4x4 all lights work excepttail lights fuses are good bulbs are new
earth leak or fuse if you are certain the sender switch at top of brake pedal is ok.Put tester on circuit to establish feed or no feed
if its burnt out, replace it, if not, check the wireing
push in the e brake pedal 1 click
has anyone checked the fuses and bulbs?