sign of a bad alternator??

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The alternator will give 13.6V without anything but the engine on. Turn on the radio and AC/fan, and 13.35-13.4V is what it will put out.

Turn on the headlights, and we are at ~13V, with most everything but the defroster turned up.

I never drop below 13, but it is possible to drop below 13.2V pretty easily with a bunch of accessories on.
 
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