Quote:
Originally Posted by ember1205
I would imagine it would depend on what actually happens in the electrical system as a whole if the battery charge is 'stopped' at any point.
If the alternator is still putting out sufficient power to actually operate the car, then the logic portion of the charge circuit the determines how much power flows to the battery could effectively go into a "maintain" mode putting out virtually no power to the battery. With no power in the car needing to be "added" by the battery, then this wouldn't be an issue for the battery at all.
OTOH, if the charging circuit slows down or stops, and the alternator's output is insufficient to operate the car, then the battery is being drawn upon and that's not good for it over the long run.
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Naw my old 70's truck/cars discharges at idle older alts dont charge well at idle like these new ones do.
Im trying to find out from a friend but I think you can use a GM scan tool and look at voltage over time to look and see how long the battery goes under 12 volts.