head lights remain on after turning off and key removed

"According to the wiring diagram, there are only 3 ways to get voltage to the headlamps:

1. Headlight switch

2. Dimmer switch

3. Backfeed from a fault in the instrument panel highbeam indicating light (can only drive high beams - almost impossible to envision this being the fault, but mentioned it for completeness)

Find the wires coming out of the headlight switch, there should be a light green and a light green with a white stripe (at least I assume LG in the wiring diagram is light green) that bring power from the headlight sw to the dimmer sw. The light green one should be switched be the headlight sw, the one with the white stripe should be always on. If the LG wire does not switch off when the headlight sw is in the off position, replace the headlight switch. If the LG wire switches, then replace the dimmer sw.

If you do not find the LG and LG/WT wires coming out of the headlight switch, then find a wiring diagram for your year (I used '97) on google image search and check for the 2 wires that come from headlight switch to dimmer switch."