pmontero did a nice post on 4wd lights, the switches in the t/case that control them, and what goes wrong with them.

The first thing I'd check is the bulb. The top of the instrument cluster pops off out of spring clips upwards if you tug gently. This exposes the rear of the instrument cluster. The bulbs are in little quarter turn holders in the p-c board, and are a push in fit in the holder. Swap with one that works and engage 4wd and see if it lights up. If not, start the wirie/switch tracing per pmontero's post.

Run the search on user pmontero and 4wd lights search string in last 3 months.

Welcome aboard.