I purchased a non-running 9n with 6V pos ground original style electoral system. Got it going, but have an issue. The negative cable that goes from the battery to the switch and ultimately to the starter gets hot as soon as the battery is connected (to the point that the plastic started smoking!!!). I obviously disconnected the battery right away. Cleaned and checked for tight connections, but same thing. Hope I didn't fry anything... what does this sound like boys???