This is my "03 F350 single wheel 7.3 automatic 4x4. For quite some time now I have to manually lock the front hubs. Maybe it would work automatically, maybe not, and now I always have to manually lock the hubs.....but I can live with that. The problem now is that the selector switch on the dash isn't working or something else is preventing the transfer case from going into 4x4, The 4x4 light on the dash also does not come on. I have checked all the fuses and they are good, I do not have a owners manual so I don't know what to look for in the fusebox. Perhaps it is on a relay? Also, I would like to check the dash switch for power coming and going but how do I get the switch out of the dash? I'm afraid I'll break the bezel around the switch if I pry too much. Thanks for any input

 

I had to replace my vacuum solenoid under the hood just behind the passenger side battery.

It thru a code for that so it is definitely communicating with the ECU and thus the dash switch.