Hello there:

Does anybody know where are the power source for the 4x4on a 2000 f250 (diesel)?
I searched the fuse box by the master cylinder & inside (driver side) of the truck...
The problem isthere's no power going to the 4x4 high/low selector switch andno power to the transfer case.
Thanks
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There should be a relay. Did you check for power at the switch under the truck. If not grab a chiltons!!

 

there should be a relay or fuse in the fuse box check both places again if u find a relay change it out with another with the same # just to test it