72 c30 chev pu new alternator barely charging, 2 new batteries,fuses ok,connections and wires seem good?
with winter coming would be nice to turn on headlights, heater and wipers. when i turn on wipers they are slow, as if not enough juice. ampmeter shows some charging when engine revs but not enough to read positive. alternator tested ok. external regulator.
Older vehicles develop odd problems, such as bad wires and connections where the wires meet their terminals, check them closely. The system you have isn't that complicated, check to see that you have full battery voltage at the large red terminal at the
@ probably the alternator. Nature the terminal connections.
@ hubs said it is your alternator or terminal connections.