Gary Greenspoon

I'm new to forum; this my first post. I have a 1994 Loyale, I have 160K km on car. PROBLEM: 4WD does not now activate: Though rarely needed, I'd engage 4WD from time to time both to test and activate its parts. I just tried it multiple times and there is no indication on dash, and no mechanical sound, so it leads me to think there is no power. Fuse panel shows one fuse as "Back turn (4WD-AT)" and the fuse is good. Any suggestions?