I have an '04 Trailblazer Ext w/ 5.3l v8. This past weekend some elecrical "issues" surfaced. My dash gauges ( gas, oil press., volt, temp) do not work, but speed and tach do. All my indicator light icons are lit up ( battery,air bag, ABS, park brake, etc.) my driver side power windows do not work, my 4 wheel does'nt work , steering wheel radio controls do not work, radio does not shut off even when key is out and truck is off, interior lamps stay on after doors are all shut, but car drives fine. It can't be a fuse because of all that is involved. I live in Michigan so I'm dealing with snowy, cold conditions. Any ideas????