93 s-10 blazer, 4x4 push button wont work?

well i kno all these s-10 push button 4wd switches hardly ever work with this one the guy told me the 4x4 relay is bad can anyone tell me where that is? it wont light up when you try to push the button in 4 high or 4 low so i dunno.

Does the button lights come on for a bulb check when key is first turned on?
How is the fuse and power to switch?