Voltage @ cruise

Was it a factory 100 amp. alternator? it might have been because of rear defroster and A/C.

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Factory 100 amp Alt.
Rear defroster not on yet, or actually before the problem, works OK now. (Sort of, all 4 rows of element.)
A/C disconnected. Electricaly and mechanicaly.
OH, almost forgot. Amp meter dead. Been dead, allways dead.
Own car 8 years.

Only about 15 miles or so., 20 min.s. or so.