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 at the alternator. The 10SI is a GM stock 63 amp alternator with an internal regulator. I would suspect a defective ammeter if I didn't have 15+ volts at the regulator, plus ammeters are pretty much bullet proof. Grounds are good - I've checked them repeatedly. I'm not aware of any secondary issues.