RE: Under dash interior light won't cut off
sounds like your door switch is bad. Not exactly sure how to fix that, but that's what I would say is wrong. Do you have the wiring schematic for your vehicle?
1992 Chevy Blazer Tahoe LT, Vortec V6 CPI 195Hp
4Dr 4x4, Wrangler Radial, Lund Visor