2002 Ford E-350 Ambulance van:Need help on trailer wiring location.

Ambolorian

Member
Greetings!
I'm new to the forum so hello from Graeagle, California! I just acquired a Ford 2002 E350 7.3L Super Duty Powerstroke Ambulance van and will be converting it into a camper and to use as a tow vehicle for our 34' Airstream. I'm getting it "Tow Worthy "and am running into some problems identifying where the wiring is located that typically goes to the rear of these rigs for the trailer plug.

I've searched underneath the rear passenger frame rail of the van and I can't locate any trailer wiring from the factory which leads me to believe its been terminated somewhere up front when they did the conversion?
According to the wiring schematic and the under hood fuse panel the factory Tow Package with relays for the trailer battery, back up, turn and running lights are all present. (22,14,C,D)

I did find two mystery plugs underneath the driver's side behind the parking break. I think one of them (the brown one) is for a Brake Controller but I'm not sure what the grey one does.

This brown plug has 5 pins with the following color wires:
Black
Brown
Green
Light Blue
Dark Blue
brownplug.jpg

And this gray plug has 6 pins with the following color wires:
Yellow
Orange
White with Blue stripe
Green with White stripe
Blue
Gray with Red stripe

grayplug.jpg

My question is:
Does anyone who's done some work on these vehicles know what the grey plug is for?
And does anyone have any experience on where I should look for the wires heading towards the rear of the van?

Thanks!
 

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