Went out to move my 2004 Dodge ram 3500 dually (diesel, six speed manual transmission) and the service four wheel gauge panel light was on. Found that the dash mounted transfer case switch does not light or work. It is in two wheel high right now, but will not switch to fwd. I need four wheel drive low function to move a heavy load. I checked fuses, dash switch plug and they are ok. I looked at the wires by the transfer case and wiggled the plugs but nothing. Everything has been working good. Any ideas on how to fix or what to check would be greatly appreciated.
Thank You

 

did you check fuse? I think it's fuse #43 should be 25 amp.
if fuse is blown may have electric shift motor going out or short in wiring. Check wires at the shift motor make sure there are no wires rubbing anywhere that could have shorted out.

 

Checked the fuse and used a test light to make sure there is power at the fuse clips. Everything is good. Rechecked the wires and I cannot see anything but I will check the plugs for power and any resistance.
Thank You