I would not be concerned with your ground straps or positive leads the way you described them, that is how most remain with 12V systems
someone converted my 53 GMC to 12 V
all they did was put a resistor in series with the original 6V ignition coil
changed the battery out for a 12V
burned out all the light bulbs
then they messed with the internals of the voltage regulator to make it charge the 12V system keeping the generator.
i have been concerned to open it up and see what they did in there
it is over charging the 12V a bit i find, but i haven't gotten around to messing with that yet
it's still running like that today, except i replaced the burned out 6V bulbs with 12V versions
my plan is to restore it back to 6V when i start poking at the electrical
Last edited by 2ManyTrucks; 12/30/2019 2:42 AM.