I can't get my 99 Ford F150 Offroad to shift into 4 Low, I have the three position electronic shifter that is mounted on the dash. It has no problem shifting between 4 high or 2 wheel but 4 low doesn't engage. Before anyone suggests it, yes I had it in neutral before shifting into 4 low. I checked all my fuses and thats not it. I also tore the switch apart and couldn't see anything wrong with it. I wanted to bypass the switch and jump the wires to see if it is the switch but dont' know the wire combinations to do that. Did anyone have a similar problem shifting into 4 low? If so, please let me know what I can do. Any suggestions would be appreciated.

Ali