Service 4wd light is on.. No lights on On the 4x4 switch...

What is your question?

I was trying to put my truck In 4wd low and it would sound like it would try to shift but the switch would just flash and go back to 2wd and blow a number 2 fuse so I replaced the fuses and tryed again and the same thing happin and tryed it one more time and happin again but the service 4wd light came on and hasn't went off yet it's been on for months now I have power to the motor and switch and front end just nothing happins when I push anything on the 4x4 switch the fuses is good and I check all the wires under the truck for anything and all looks good I been told it could be a switch or transferase seniser or something like that SOMEONE PLZ HELP ME FIXS THIS THANKS