[bobcowan]

Wierd problem recently showed up.

After driving for a short while - like an hour or so - the car dies. It's not quite like turning the key, it sputters a tiny bit and then dies.

I happened to catch it on a data log. Just before dying out, battery voltage rapidly climbs to 20v, and then the car shuts off. It probably trips the breaker for the ECU, which controls fuel and ignition.

That started about two weeks ago. I replaced alternator and voltage regulator. That seemed to fix it, until 2 days ago. Then it hasn't done it until today.

It seems like something is overheating. It only occurs during the day, when it's hot - like 90-95*.

What are the symptoms of an overheating alternator?