It appears the pigtail (located under the bed that the 7 pin trailer wiring harness plugs into) is completely dead. I need help in finding where that starts (engine compartment or under dash) so that I can trace where the problem is. Any one have a wiring diagram for the 03 Ford F-350 with Powerstroke 6.0?

 

I do.. send me a pm or email me
Josh@fully-lit.com