SOLVED: Wiring Diagram for F-250 7.3 diesel 2002 - Fixya Dec 21, 2009Wiring Diagram for F-250 7.3 diesel 2002 - 1999 Ford F250 Regular Cab. Posted by cpiofhouston on Dec 21, 2009. Want Answer 0. Clicking this will make more experts see the question and we will remind you when it gets answered. Need wiring diagram for 1990 ford f-250 4x4 diesel. the glow plug system. 2002 Ford F250 Super Cab 7.3 Diesel - There is no power Jun 17, 20082002 Ford F250 Super Cab 7.3 Diesel - There is no power going to the trailer plug harness. I trace two wiring harnesses back to the engine compartment where there are four relays. Two of these relays operate the brake and trailer system. Is there a way to test these relays at home to see if they are operating correctly?
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