Originally Posted by Mat7783
I stand corrected as it was putting out 14v under the conditions mentioned until my ride home and now was dropping to 11.5 under full load over 2000 rpm at 65 mph.immediately rises to 14v when speed is under 50mph��
That sounds like a diode in the voltage regulator of the alternator could be the issue (most likely non replaceable).
Depending on the size (physical) of the alternator, you may be able to have it tested at a regular automotive parts store. If not, a motor repair shop can likely test (and repair) it.
The alternator should generally put out 13.8 to 14.7 volts. 12.6V will never fully charge a lead acid technology battery (SLA, AGM, GEL) and 12V is roughly 50% discharged.
Also don't rely on any installed gauges for reading those voltages.
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