93 Ford Ranger 4x4 light always on



oh shit, thats now what i meant to paste. but anyways, the problem is, My 4x4 light is always on when i turn the truck on. Never turns off, Ive tried to press Low Range button, nothing, tried pressing 4x4 to see if it goes off, Nothing. It isnt on, because i can go 85 mph and it not be a problem. But however, i went mudding not to long ago, and i got stuck in a hole and tried to back out. and when i did so, my buddies who were pushing in the front said that the left front tire shot dirt at him, and only way it can do that is if 4x4 is on. i can never turn the light off. any ideas?