When I got a rebuilt alternator installed from an alternator shop that’s been doing this kind of work for 30 years - the voltage never dropped below 14 volts even with dual 80 watt halogen headlights on at idle.
My old alternator dropped voltage.
With this new alternator, when the engine was...
Always suspect the original gauges.
I’d hook up a hand held digital volt meter to the battery while the engine is running to verify voltage.
Then with engine still running I’d turn on the headlights and cabin fan on full to put a big draw on it and see what the voltmeter reads.
A good...
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