When I start the engine of my 75 camaro, I can see on my amp
meter that when started, the battery keeps discharging.
The alternator is spinning, and the belt is OK.
Also I notice slow windshield wipers, and slow electric windows.
Only after I rev the engine up to high revs, the charging
circuit suddenly kicks in. After that, the battery is
being recharged, also at low revs.
I cleaned the contacts on the alternator, and the alternator
is only 2 years old or so.
Should it be replaced? Can it be refurbished?