I don't think there is one. I had my dealer install a brake controller and they found that all the wiring to the 7-wire plug at the back was all messed up. I picked up a 7-wire test plug just to make sure all was well.
If you look through the Ford builder's guide for the E-350 you see all kinds of notes like: "Not on stripped chassis" when referring to the brake controller circuitry.
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