100 amp fuse blows

[Blue97]

Hi, I'm new to the forum, but have had a Corolla for ten years. I've developed a problem and was wondering if anyone else has run in to this. The car is a 97 and the 100 amp fuse to the alternator blew. The alternator was replaced as well as the fuse. One month later, after hitting a bump, the same thing happened. I replaced the fuse and checked the alternator, which was good. I suspect an intermittent short due to either a loose wire hitting a ground or a frayed wire doing the same thing. If anyone has had this problem I'd appreciate any help you could give. Thanks.
Rob

[Flashmn]

probably you're right about the wire, time to check for loose connections.

[Blue97]

Nobody else has had this problem?

[powellsd]

i would check your wiring and connections going to the alt and leaving the alt. Sounds like a bad connection somewhere around there.

[toyomoho]

Check the wire between alternator B+ (large wire) and battery for problems.

[fixitfan]

I have the exact same problem about blowing the 100 amp fuse relay but don't think it's alternator related gotta be a bad ground on positive or negative cable. Question do you get any spark when you attach the positive battery cable to the battery terminl post?

[fixitfan]

Also as a follow up check out your voltage regulator could be bad.

[fixitfan]

Never mind about the voltage regulator my bad its a bad ground check negative ground wires to chasis and motor.

[fixitfan]

Hi Blue97,

Was wondering if you ever found the short that was blowing the 100 amp relay

If you did could you share the answer.

Thanks