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Re: Brakes killing fuses...
There is a short in the wires, it is very difficult to find sometimes but if you pull back the carpet along the drivers side you should see a bundle of wires that go to the trunk, start in the trunk at the lights so that you can tell which ones to trace and look for a wire that is burnt or cut, splice it back together and that should fix your problem
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you have a short in one of the light sockets or a worn wire from the wiring harness. could be the flasher assembly. are the turn signals different bulbs from the brake lights? Does using the brakes blow the fuse? (Rear lights or brake light switch on brake pedal). left or right turn signal blowing the fuse will tell which side has the short. 4 ways only, replace the relay.
disconnect turn signal switch wires @ column, put power to wires to brake lights. that cks wiring to lights. next put power to wires through turn signal to ck switch. Power runs from brake light switch to turnsignal switch, to lights.
Bulbs work just like a fuse. When old they just short out like a weak fuse bowing out. Since the lights do not have a fuse you need to replace the headlamp switch for this switch controls the tail lamps. The directionals are controlled by the directional switch, and the brakes are controlled by a brake light switch. Those have fuses for they have switches. Headlight switches do not have a fuse
If the third brake light works and the regular ones don't, it is most likely a bad turn signal (multifunction) switch. The switch is able to kill the brakes lights to run the turn signals, and in rare circumstances does this. I've seen it several times. It could also be wiring, especially near the turn signal switch, but it is usually the switch.
there should be a switch on upper portion of your brake pedal that connects the brake light circut when you apply the brakes. inspect it and try shorting the two wires together when you do you should have lights. if that works replace the switch
I had the same problem with my 2001. I found it was the multi function switch. Better known as your turn signal switch. I found that the hazard switch portion of it had shorted. replacement is fairly easy, aftermarket part is available, much cheaper than GM.