What Tells The Alternator What The Battery Voltage Is?

[KRISKARRERA 2 1 Cars]

Is it the smaller of the two alternator wires, the one that goes to the voltage regulator?

[applemobile 0]

the smaller wire on the altenator goes to the warning light on the dash. the bigger wire goes to the battery. the bit your thinking of is inside the back of the altenator.

[Miles 331 1 Cars]

The battery sends a signal to the Alt so it know's what voltage the battery is, Multiplexing it's called!!

[KRISKARRERA 2 1 Cars]

Yes but where does the alt get it's info from on the battery voltage? The big wire or small wire?

[Miles 331 1 Cars]

Big wire, The small one does only the warning light, nothing else

[KRISKARRERA 2 1 Cars]

Thanks Miles.

I put the voltage regulator from an old alternator on my current one and it seems better now.