31 vicky and Rusty are correct. Most of the time a light that won't get turned off causes a weak battery. The voltage regulator, alternator/ with reg.,etc. is probably causing your problem. Pull the fuses one at a time, unplug the big stuff, if the light doesn't go out start taking the fusable links loose from the solinoid one at a time. When the light go's out look at all the circuits on that fuse. It could be anything, but hooking up the test light is the best and cheapest way to not guess.