Really just the battery, buddy. The pic I posted of the melted wiring was just tongue-in-cheek. (That's what happens when the main battery ground to the gearbox fails.)
You could certainly be damaging some bulb filaments, relays, and fuses. But mostly it's about the battery. Seems your Regulator/Rectifier has failed. Mine seem to go about every 30-35,000 miles.