Ok, so here's what I've learned. The tail lights, turn signals, and fuel gauge run off the battery, which is constant DC. The headlights and gauge lights run off the rectifier(regulator), which is also DC, but not a constant current. To run HID's, you would need to run direct wiring through a switch, then through the ignition, then to battery. It's not wise to ground off the frame, so you would want to direct wire the negative wire to the battery as well. You would also want to modify or replace the stator(alternator) to compensate for the additional drain on the battery. The other issue is the heat from the bulb. Apparently, it's hot enough to melt the enclosure and lens. This can be remedied by venting the headlight enclosure. Hope this helps!
