Like your car, Jim. You don't see very many Dodge coupes around here, mostly fourdoors. I'm no electrical expert, but regarding the 12 volts for starting, I will just repeat what several others have said in the past....no real need for 12 if the original 6V system is in good condition. Good wiring, O or 00 gauge battery cables, generator and regulator working properly, etc. I think the 12 volt power inverter is most simple to run accessories like stereo. I can see you have been giving it a lot of thought however. There are also some 6volt alternators out there. Bob