My 06 Super Duty had 4 pass thru wires and I recently bought a 2011 and it looks like it has as many as 18 pass thru wires. Can anyone tell me if this is correct and where I might find them in the engine compartment.

 

Eeven in 2008, they only show 4 wires that are cut going through the firewall. They show other cut wires for upfitters and other uses. Click on this link. https://www.fleet.ford.com/truckbbas...bb_pdf/349.pdf

If you have a faster web service than I, you can probably hunt around in the that link and find info on your specific truck.

 

Thanx Dave,
I have since found out that the 18 wires under the dash are pre-wiring for a PTO.
Brian L