hi i have a 1998 Blazer LS 4x4. my illumination lights recently went out. all my brake and turn signals work. the shifter and odometer still work and all the gauges work its just the illumination. the illumination on my windows and locks still work. i have checked all fuses none wer blown. and i do not have power goin to Illum. fuse in the cab. if i jump power to it the light switch will light up but my dash and heater dials still wont. and when i turn the head light switch on the compass and outside temp screen goes out. would all this be caused by my switch or do i have a short some where under my dash. and input is greatly appreciated