[Purdy Swoft]

One of the field coil wires usually grounds under the output terminal or in some cases under a ground screw . the other field coil wire connects to the third brush . If the field coil wires get reversed the generator will still charge , usually at maximum rate . Moving the third brush up or down will have no effect on charge rate if the field coil wires are reversed ... If the wires are reversed it will damage the field coils very quickly . Sometimes when polishing up the commutator The brass will will transfer and ground out the commutator. I always use a hacksaw blade to under cut the gaps on the commutator . If you tested to see if the generator would motor and accidently touched the ground wire to the out put post , you will need to repolarize the generator or it won't charge .