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88 Bronco II. When truck sat for a week. The battery went dead. Jumped it and it ran and started fine. Truck sat for 4 days, bateery was dead again. Bought new battery and during replacement, I connected the positive connector to the battery, and then the negative cable. When I connected the negative cable, a green wire that was connected to the solenoid/relay on the fire wall started smoking. Now nothing works. No gauges, no radio, no courtesy lights. Nothing...
If "C" is burned out, I would suspect there maybe something wrong with your alternator. The alternator being bad would also explain the mysterious draining of the battery too.