dont try at home!
87 RC over-charging with ammeter pegging on the high side. Turn on all accesories to bring meter down. Get to the house and consult manuals. One sez bad cell in battery. Swap batteries, no help. The factory manual sez grounded or disconnected field in alternator. Start RC and disconnect positive terminal on battery, making sure cable does not contact anything. Get back in vehicle and increase rpm's. Ammeter goes up, all courtesy light bulbs explode, voltage regulator does its immatation of a bbq pit and I get lots of bouncing sparks in the floor board. Take life time alternator for exchange, replace voltage reg, courtesy lights (3), and 3 fuses. Hookup, buttonup, and restart RC. Ammeter resumes regular operation. Turn on headlights, RC dies and refuses to start. Replace Elec control module. All ok for now. Visual inspection showed no melted wiring.