I took the starter apart, cleaned the motor and replaced the brushes. Reinstalled starter motor, starter which works fine but I went to star her up gas engine fires 2 or 3 time then quits!!!!! Me thinks it is running on the 12 volt system but fails to switch to the 6 volt system? I think I must have buggered up the 620 starter switch located on top of starter motor most likely the copper contact on the inside which is connected to the small wire that runs to the resistance module in the ceramic fixture under the dash . I need to know what small copper strip makes contract with in side the switch. Or have I screwed up some thing else up?