Had the same problem when I built my custom dash. I thought that i could just unplug the gauges and run my autometers. Wrong!!! I can't remember exactly what I did to fix it but I do remember it had something to do with the stock volt gauge being disconnected. I think there was a input and output for the volt gauge so I just connected the two wires. I think that that the wire that gives you a reading on your gauge is a sending wire for the voltage regulater if I remember correctly. If it is not connected it will not get a reading and the alternator will not know to charge.
Hope this helps,
Wade
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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