Kevin, A low voltage situation at idle is normal in the DeLorean especially with accessories on like headlights and a/c. I have one of John Hervey's 140amp alternators in my D now, and it is a vast improvement; however, at idle the system voltage will be less than 12 volts with the a/c on. A slight increase in RPM will bring the voltage up to a reasonable level. You might try using a smaller pulley on the alternator so that it will turn faster, but there are limits to how small you can go. I have seen larger pulleys in aftermarket catalogues to slow the alternators down for racing purposes. (The slower the alternator runs, the less horsepower it takes away from the car). I would like to do this for the DeLorean, but... BUT... then you get too low a voltage at idle. I suggested designing a two speed alternator a while back, but it quickly got moderated off the list. Someone suggested using two alternators -- one that runs at high RPMs at idle and then kicks off at higher RPMs. This might be done with an a/c compressor clutch, but I have more important projects to work on. I suggest trying a smaller pulley or a better alternator. I already have a better alternator with a somewhat smaller pulley, and it could be better. Although I believe that it is the best out there unless John's newer 150amp alternator is any better. Ideally, someone needs to come up with an alternator that will put out a lot of power at low RPMs yet be able to handle spinning at very fast RPMs without flying apart or taking too much horsepower from the engine. Some guys will say that any alternator should handle excessive RPMs and that it won't take away from the horsepower too much. If you are one of these guys, then put the smallest pulley you can find on there. Food for thought, Walt Tampa, FL