Blowing fuses

[billychop]

Went for a short local ride last weekend and blew the fuse going from my battery to the ignition switch. I had one on me so I replaced it and it immediately blew when I turned the key. I get it home and start trying to eliminate things. I start by taking the wire that feeds the brake circuit off the ignition switch, new fuse, hit the key and it starts right up. So I assume it's got to be in the brake circuit so I rewire the whole shooting match. Get it button back up, hit the switch and blow a fuse. I take the wire that feeds the brake circuit back off the ignition switch and no fuse blows. I checked the bulbs in the tail light/brake light and both are good. Anyway the brake light switch can cause this? Seems it's the only thing I haven't eliminated.

[pamcopete]

billy...,

I would change the brake light even if you think it's OK. Sometimes the filament will short out but there is still enough of it left to light up.

But, it is possible for the brake light switch to be shorted to ground internally and that would also cause the fuse to blow.

[speez]

here's an old school trick, put a bulb or a test light on the wire you disconnect (the other side to pos. of batt.)and remove the bulb from the rear it might cause feedback if the bulb lights up you have a short now you can check the switch and wires if the bulb turns off you found the short!

[madmax]

Check you rotor resistances, blowing fuses is an early warning that it's on it's way out.

Max