2005 TBC...no trailer brake power until over 10mph - Page 6 - Ford Powerstroke Diesel Forum
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post #51 of 52 Old 06-01-2019, 11:06 AM

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i see references in the harness to BCM inputs and there will be a 0 chance we will find what info is coming over the BCM to the controller

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post #52 of 52 Old 06-02-2019, 06:37 PM
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You could try a switch hooked to 12v with a resistor so you could lower the voltage to want you might find at the trailer brakes and then hook the other side to the wire going to the brakes after the controller. You most likely would not want 12 volts back to the brakes because that would most likely just lock them up at that speed and cause more trouble than help. With a little experimenting with different resistors you can come up with a close voltage to apply but not lock the brakes. You may need to try this where it is safe so as not to have an accident if it is too much voltage, and you would want to measure the voltage to the brakes at a slower speed to get close to what you will need. This is how aftermarket units give lighter brakes at slow speed and more at higher speed inside the controller with the pendulum that tells what to apply. I shorted my wiring at the trailer in the past with 12v and it feed back into the controller and burned it out so another reason to stay away from 12v.
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