Messed up the title and prefix let's trey again. I'm switching to 12 V on '35 Ford, installing one wire alternator as well. Already have changed all the bulbs. Gauges don't appear to need anything as Gas gauge is pressure type no electric and it shouldn't matter on the amp meter. Been told starter will be fine and turn faster ( a good thing ). - With the stock '35 ( new wiring ) in place can I use the existing generator wire in harness to connect the one wire alternator? Looks like yes looking at the wiring diagram? - Do I need to convert from Pos. grnd to neg. grnd as part of the 6V to 12V / alternator conversion? If I do dose anything else need to be changed. - Will the coil connection be effected?