2004 chevy impala....my brake light fuse keeps blowing...fine when you replace the fuse but then when you step on the brake it blows (the fuse that say BRK SW}

Short circuit most likely in rear light wiring

replaced brake switch ??? If you don't know how to read a wiring diagram an use a volt meter to test electrical circuits ,your better off taking your vehicle to a qualified repair shop .

Fuses blow because there is an overload on the system. If the fuse blows when you step on the brakes then there may be a short in the wiring from the brake light switch to the lights, abs module or turn signal switch. If the fuse blows when you turn the key on then there is likely a short in the wiring to the brake light switch. Basically you will need a wiring schematic to check the wires at the switch and at each of the loads. Also verify that the fuse is supposed to be a 10 amp fuse. Hope this helps

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.

Maybe need a bigger fuse

check wiring on shift columb going to turn signal switch it could be the switch it self I had this happen on a new chevy truck hope this helps good luck jerry

brake light switch may be bad

your fan is most likely shot. pull and bench test your fan.

there is a short circuit in the brake light wiring it could be in the lamp holders them selfs pull off the wires to the brake lights holders on all the lamps and see if it still blows a fuse if it dose then the short is in the loom not the lights them self's if it dont blow a fuse hook up one light at a time untill it starts to blow fuses again the last light to be hooked up that blows the fuse is the faulty light

I had the smae problem, i replaced the tail light circuit board and the problem was solved.