Quote:
Originally Posted by fastd
follow up:
there was no dedicated ground wire directly on the alternator (was grounded through the bracket); adding the ground wire definitely helped improve the voltage but it still drops down to 12.2-12.7 for like 20% of the time at idle after it gets warm. The regulator and battery grounds seem good.
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The black wire to the alternator (as all black wires in the harness) are grounds. That particular wire is grounded at the firewall near the starter solenoid. That is where I would check first. The voltage regulator is also grounded to the same connection. A lack of ground at the regulator might give your symptoms.