Sounds like you got a pretty difficult to diagnose problem.. With regard to the light bulbs, I was more concerned about one of the wires to the lights or at the bulb socket itself being shorted to ground... so I would expect it to draw more than the rated amps of the bulb..

Maybe I'm getting confused by by your last post, but it sounds like you have multiple circuits or places drawing above average idle current..

Any history on this vehicle? i.e. flooding, running mud off road or past collision damage?

2000 4Runner,V6,Auto,31's, Sliders, Skids, On-Board Air, Air Shocks
Related Interests: Welding, Ham Radio, Road Tripping (Blue Highways), High End Video/Audio Systems