Originally Posted by Sniper
Why would the field terminal be grounded? The brush holder is most likely the culprit, assuming he didn't measure the one that is supposed to be grounded.



This is 69 car. So one brush is grounded. The rotor grounds out, the field terminal (on alternator) grounds out. Of course the insulator could be damaged and the terminal is touching case of alternator again grounding out. Easy to check once alternator is off the car.