The signals to send power to your brakes through your brake pedal and through the manual override on your Tekonsha P3 # 90195 are completely separate so it sounds like there is an issue stemming from either the trailer wiring or brake assemblies.
Start by making sure your brake assemblies are properly adjusted. Use a tool like # W80630 (as shown in the "Trailer Brakes and Wiring Installation" video below) to turn the star wheel until the drum tight enough that it is barely able to be turned... view full answer...
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