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Hey Budd, The distributor dont care if its pos or neg ground (assuming its a standard Delco), but the coil does to some extent. First, theres no reason to change to neg ground, thats usually done when changing from a generator to an alternator cuz as I said above, the distributor dont matter. If you leave it as is, your ammeter (if you have one) wont need to be rewired either, and you wont have to worry about re polarization or whether the Voltage Regulator is ok as + or - ground either. Coil wiring is a lil more tricky, cuz it depends on if you have an automotive (prob for neg ground) or original JD coil. If the coil is a 12 volt internally ballasted, you dont want it wired such that the internal ballast ends up between the distributor and coil, and I cant tell about your coil sittign here and probably not even if I had it in front of me (unless I had Supermans x ray vision lol) Also, is the coil a 6 volt intended for an external ballast or a true 12 volt internal ballasted coil??? If its a 6 volt and you dont add the external ceramic ballst resistor in series with it, it will run very hot and eventually go bad plus the points will burn out prematurely. If the coils primary DC reistance measured between its lil + and - termnals is around 1.5 to 2 ohms, its prob a 6 volt coil. If it measures around 2.5 to 3 ohms, its prob an internal ballasted 12 volt coil. If its a 6 volt coil and youre at pos ground, I would wire it + to the distributor and see how she runs. Also, you would have to add a series voltage dropping ceramic ballast resistor of around 1.5 ohms at 25 watts between the ignition switch and the coils non distributor terminal to reduce coil voltage to 6 volts as designed for. If its a 12 volt internal ballasted coil and an automotive neg ground type, I would first wire it - to distributor and try it, cuz my guess is the internal ballast is ahead of the + terminal. Sooooo oooo see if the coil is a 6 or 12 volt and rememebr if a 6, you need the ballast and (if youre at + grnd) wire it + to distributor. If its a 12 volt coil no extra ballast needed, and if unsure, I would try it first as - to distributor and then as + to distributor and see if it makes any noticeable difference in starting and running, cuz it wont harm anything either way, its just more efficient if wired corrrectly. You will also need an ignition switch of some sort fed off the ammeters load (non battery) side terminal (side that is wired to lights and BAT terminal on the VR) and then through teh switch and down to the distributor or ballast resistor. Post back any more questions and good luck n God Bless the USA Ol John T Nordhoff
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