I've got a '96 P10. The other day it wouldn't start after a routine 20 minute trip. When AAA got there the car started right away. So I took it to my mechanic and the car tested completely fine. A week later, I was driving to work, then I heard a pop through the radio. I turned the radio off, but I could hear a whine through the speakers that went up and down with engine rpm. The motor then cut off five minutes later. Afterwards, I turned the key and it started right up.

My mechanic thinks it's the alternator going bad, but he's reccommending that I wait until it fails, since these things can be tricky.

Any thoughts?

When the car wont start, disconnect the alternator. If it is faulty the car should start straigt away.

Thanks