Is it possible that the alternator could ever keep up to having all the accessories on? With the rear window defrost, headlights, heated seats, and climate control, I am drawing about 56 amps. Is that a lower output than it should be? That is when my battery voltage drops to about 11.8volts at idle. Is this normal? When I rev the engine a little it comes back and with everything off, it is around 14volts.

TIA,
Steve

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1997 E320
1990 Nissan 300ZX Twin Turbo (Stage X+)