I don't use the boost feature on my P3 because I found the trailer brakes too grabby while driving slow speeds. Follow the instructions in the P3 manual. I believe it says to start at a low gain setting, drive the trailer to about 30 mph and apply the P3 manually. Raise the gain until the trailer brakes start to grab but not lock.
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2018 28BHBE
2017 Ford F250 XLT, 6.2 gasser
2013 26BH (traded)
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