67 Barracuda Heavy Electric Load

DallasMan2000 said

So the needle went slightly towards the D when the car started then quickly moved back to the middle. I also measured 12.17 volts at the alternator post once the car started.

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That does not sound like an ammeter. Right after start up with an ammeter the needle should head toward C as the system recharges the battery. Either the gauge has been converted to a voltmeter, or the alternator is not charging to recuperate the system after the drain to spin the motor.