I have a 2003 F-150 FX4. I am having problems getting it into four wheel drive. I turn the switch and nothing happens, not even the light on the dash! ! Does anyone know where I should start? I DID look/check every fuse that I could think of and still NO luck. I would appreciate any help on this matter. Thanks

 

I had a similar problem with a 1997 F-150. My problem ended up being the wire from the PDB that feeds the relays, corroded and broke away from the PDB. Fixed the wire and things started working again. Don't know if your truck is old enough for this to happen but I thought I would just pass this along for you to look at.