I have a 2003 ford f350 6.0 powerstroke it has manual locking hubs and electronic shift 4 wheel drive. I have changed all the fuses under the steering wheel and both relays under the hood. I have changed the transfer case shift motor. I have tested the power supply to both the relays and shift motor and neither are receiving power. If someone could please point me in which direction to go and a place I can find the correct wiring diagram for this problem. I have also changed the 4x4 switch it self.

 

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SO, is the issue that you're not going into 4 wheel drive? What are your symptoms?

 

isn't the 03 ESOF computer activated?

 

Vacuum leak to the hubs?