72 overcharging

Mattax said

Measure the voltage difference between the alternator and the regulator's sense terminal (or as close as you can).
Measure the voltage diffenrence between the alternator case, the regulator case,

(In addition, you can also measure the difference to the battery neg and pos.)

Click to expand...

This is not correct. I realize that in most of the vehicles we deal with here, the alternator case is "always" grounded to the engine block, and the battery is "always" grounded to the engine block, BUT THE ALTERNATOR MIGHT NOT actually always be. Some alternators require a separate ground wire from a grounding post on the alternator. The case is not grounded to the circuit, or may not be considered a "good" ground.

(The old mid/ late seventies "big frame" 100A Chrysler had a separate grounding wire/ post off the alternator.)

And actually, that is not the point LOL

The ACTUAL point that the VR power and ground needs to see is AT THE BATTERY. Therefore, always check both ground circuit and hot circuit in relation to the battery posts themselves