1994 S10 Blazer 4wd switch not lighting up
 

My 4wd electric switch is not lighting up and the 4wd is not working. I was switching to 4wd and the green light was flashing and then the light stopped and there was no 4wd. I assume there is a fuse blown but I cannot figure out where it is. Under the driver's side dash there is the fuse box but none of the abreviations say 4wd. I also think that for the fuse to blow there must be another problem but I have to figure out where the fuse is to proceed. I replaced the shift motor on the transfer case about a month ago, and the 4wd has worked since then. Thank you for your help.