Wiring Diagrams


ursus combibo
Jun 22, 2006
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I recently had an issue with the Under Dash wiring diagram and component locator while repairing the 4WD on my truck, which is a late build '99

specifically, the diagnostic article from Mitchell On-Demand and it's component locator shows the low-to-high and high-to-low relays located in a block behind the center of the dash... I removed the dash and heater box, the relays were not there.. however, the RPO relay block (one touch down, power door lock, etc) relays were there.

I then looked at the wiring diagram component locator, which indicated there were under the center of the truck... again, no relays...

they ended up being in a separate block, beneath the PDC under the hood.

The 10-pin connector for the relay block does not exist, as well.

FWIW, the component locator & wiring diagram for the 4WD system ended up being most closely represented by the one listed for a '00 F350.

Anyone that has the PDF copies of the diagrams I shared, if you run into this, let me know. I will give you alternative pages to replace your diagram with.

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