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- #1
The 08 superduty has a trailer brake controller that isn't compatible with trailers that have hydraulic over electric, or surge brakes. Ford has a kit (its a wiring harness adapter) that helps with the changeover. You need an aftermarket trailer brake controller, then wire it into the new harness. The harness plugs into the connector that was into the back of the tbc module. After installing all parts, you need to have your dealer disable the trailer brake control module (in the personality settings of the instrument cluster module).