July 19, 2011My 06 F350 PSD:
The 4WD wont engage when you turn the Dash Switch on.
Replaced the electronic Module.....nothing.
Replaced the engaging Motor on the transfer case.....nothing.
Bypassed power past the solonoid, to the engage motor....nothing.
The 4x4 wont show up on the dash, and 4WD will not work.
What else can we try here?????