Quote:
Originally Posted by bigoledave
It is described as 12v....so ..ok!
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My Delco 10Si alternator (same as yours) produced 14.7V originally. If yours does the same, with electronic ignition you risk engine shutdowns due to an overheated coil. I'll guaranty this: despite the 12V description there's no way its output is less than 13.8V.
Once I installed mine and measured the output for myself I replaced the internal regulator immediately down to 14.0V. There are several threads on the subject but
this one explains what's going on pretty well. The discussion centers around coils but the coil input voltage is a critical factor. Since the alternator is producing when the engine is running, its output voltage is what the coil receives less any systemic voltage drop (voltage drop should be less than 3%).