Compression Ignition Addict
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This is all I can find so far ..............
At very low speeds, including at rest, the Ford controller sends a proportionally smaller amount of output voltage (though not zero) to the trailer brakes to provide smoother stops. This low-speed adjustment is the reason manual activation of the Ford TBC cannot be used to verify the operation of the trailer brakes.
You might try the tests below:
Drive the towing vehicle and trailer at 15 mph (24 km), at the maximum gain setting (10.0 for Ford TBC) and manually activate the Ford TBC. If a large deceleration is felt (a "jerk") the trailer brakes are operating correctly.
If it is absolutely necessary to have a test initiated with the system at rest, set the controller gain to maximum (10.0 for the Ford TBC) and manually activate the controller with vehicle in PARK. Have an 'inspector" kneel beside the trailer axles and listen for the "hum" an electric trailer brake will produce when current is being sent. If the hum is present, the trailer brakes are operating and the Ford TBC is sending its speed-adjusted output.
Another suggestion for a test with the system at rest would be to disconnect the trailer wiring from vehicle. Using a wire with clip on one end and a needle on the other (rated for 30A), attach the clip end of the wire to the battery charge terminal in the vehicle connector attached to the bumper. This pin corresponds to the black wire, and when looking at the vehicle connector, is in essentially the "1 o'clock" position (or the first pin when traveling clockwise from the 12 o'clock position – refer to figure below). Then rest the trailer hookup connector so it won't move around easily and insert the needle end of the wire into the brake output pin on the trailer connector. This pin corresponds to the blue wire, and when looking at the trailer connector is in essentially the "7 o'clock" position (or, the 4th pin when traveling clockwise from the 12 o'clock position). This will essentially send 12V to the trailer to charge the trailer brakes, but will not cause any potential damage to the emergency breakaway system.
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Last edited by bismic; 05-28-2019 at 12:42 PM.