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Mike P, if nothing else it's great to hear I'm not the only one dealing with crappy voltage regulators. Have you experienced the failure intermittency I'm dealing with? I will take your suggestion...

JHMO I've checked and rechecked grounds but I get your point - maybe I missed something. Next time the alternator starts misbehaving I'll do as you suggest and ground the alternator directly to the...

Joatmon, that's an interesting observation that just may be the problem. However, since the alternator is putting out >15 volts when the ammeter is pegged I'm not too inclined to believe that the...

Driver, please see my reply to Firebird. You do bring up another possibility in a defective battery. It's fairly new from Costco and if memory serves I had this problem with the old battery that...

Firebird, I've got the stock gauge which is an ammeter. The gauge pegs at 30 amps and when all is running as it should the gauge registers about 8 amp. I'm getting my voltage reading by using a VOM...

Astroracer, the external regulator is long gone. I totally rewired this car with a new harness and then some custom work to accommodate the L98 350. That was more than 10 years ago.

That sounds an awful lot like I'd be ignoring the real problem - whatever the hell that is. I know lots of folks use these 10SIs without this issue.

I install a new (NAPA rebuilt) alternator and all is well for anywhere from a few minutes to a few months. This last time it was just a few minutes. Start the engine after the install and all is...