Mechanics

FUSE BLOWING OUT WHEN BRAKES APPLIED

1993 Toyota Corolla

I have no brake lights replaced the fuse worked for a few than blew after I applied the brakes a couple of timed why replaced the fuse like four times and every time the fuse blew checked all other fuses and they r fine why does it keep blowing
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Chevyman75
September 27, 2013.



Please use some punctuation, otherwise we don't know how to read that huge sentence properly. I did infer a fuse has been blowing multiple times, and you're confused as to why another one would blow. Obviously there's a short and the fuse is doing its job to protect the wiring. No amount of new fuses will fix the short.

A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

In this case you can place a stick between the seat and brake pedal to hold the pedal down. The brake light circuit will be turned on. If the test bulb is only lit up dimly, move the wiring harnesses around in the trunk, wiggle the signal switch, and / or bang around the back of the car with a rubber mallet. If you see the test bulb get bright or flicker, you're in the area of the short.

Caradiodoc
Sep 28, 2013.