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If the charging circuit is stock the voltage you are reading at idle is probably correct , mopar altenators of that era don't jump to 14ish volts till about 1400 rpm ... i think that is the rpm i have seen posted .

You should have something close to battery voltage at the coil when starting , you have something somewhere that is not maikng a good connection and has some resistance. How are your connectors from the column to the dash harness ?



you can prove the point by putting a jumper from the battery to the coil, and then, hit the key. If it cranks right up, it is a voltage loss problem as suspected. Go ahead and get the battery charged up to eliminate that possibility and check the gap as well, but, like he said, you should be reading within a couple-three tenths of the battery voltage at the coil...the drop will get bigger with load in most cases.

Steve