Hudsoner-
The below is an educated guess. Ford took the reference info for the 2000 F-53 chassis off its Web site. There are also some diagrams on iRV2, but I'd have to dig to find them. iRV2 user "Subford" often responds to 2000-and-before F-53 wiring questions.
Follow the wires forward from the coach hitch connector. The wire bundle usually follows the driver-side frame rail. Within a few feet, you may find two brown, black or grey connectors, each about an inch square. Those are the Ford connectors. The brake controller wire is in one of the pigtails attached to those connectors.
If you find the connectors, take a picture or two of each (especially if you can get pictures showing the wires entering and exiting) and post them here.
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Mark
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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