Ok so i have a 1993 K1500 Auto transmission with a 5.0 and my 4 wheel drive worked all winter without a flaw.Now today i needed to use it i was rolling about 20 miles per hour and pulled the lever into 4WD HI and the indicator light never came on. So i checked the indicator light bulb and it was good. I checked the Fuse and that was good. (i put a new fuse in just in case and that still didnt work.) So now i dont know what to do. Any ideas.

 

im sorry wasn't paying attention this should be in silverado