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Phil, You didn't say whether your 12v CA is positive ground or converted to negative ground, but here are some suggestions: First, if the CA is positive ground, you can convert it. The starter won't care since field reversal counters armature reversal within the starter motor, and it will run the same direction either way. The only thing you will have to worry about is any electronics that may have been added (1,000 stereo for your rap music), or permanent magnet motors. (radiator fan or windshield wiper? -Not too many of those on '40s A-Cs) Just by luck I was putting a Delco alternator on a WC about two weeks ago. The Delco was ordered for a '68 Jeep with 225 engine, because they used a little Motorola alternator for that application that drops right into the A-C 201 CID with minimal clearance problems. Now there's a Delco-type replacement for the Motorola. Anyhow, the kid at Checkers Auto ordered a regulator for me. This kid was born since both generators and external alternator regulators went the way of LP records, and imagine my surprise when his "universal replacement regulator" arrived a week later but it was a generator regulator instead of an alternator regulator. What luck - I need several of these terribly. The generator regulator is a Niehoff #AL167 which rang up as a Checkers Auto #PA 6349468 Voltage Regulator for $29.99, and it will work fine for your CA's 12 volt generator. Of course, you should not use any part of the old Allis lightswitch resistor setup. The Niehoff regulator is a full current and voltage regulator, not just a cutout relay. If you do change ground polarity, be sure to blip the BATT terminal to the ARM terminal for just a moment to repolarize the generator when you finish the hookup. Incidentally, JC Whitney has electronic regulators for GM Delco alternators that use external regulators, and for Chrysler Mopar which will work for nearly every other 12 volt pos ground external reg automotive alternator. That's very handy for tractor apps rather than internal regulators because it's easy to provide a 120vdc power tap from an external regulator alternator to run power tools.
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