Not enough "output" from brake controller?

[husbus]

With my previous tow vehicle and its aftermarket P3 Prodigy brake controller, I could easily adjust the gain and achieve desired braking performance, for my travel trailer with electric brakes, usually at around 75% gain.

With my 2021 RAM 1500 5.7L eTorque 4x4 tow pkg, I don't get enough bite in the brakes, even with the gain all the way up to 10. I don't believe there's anything wrong with the brakes themselves, because the breakaway switch will lock up the brakes completely.

I measured the voltage in the trailer brake wiring using a regular multimeter, and with the vehicle stationary, gain at 10, and 100% braking power applied on the manual slider, I see 9V. If I reduce the gain to 5, I see 5V. I would expect 12V at full power. However, I'm not sure if stationary testing conditions are valid. Also, will a multimeter measure voltage correctly on a PWM circuit... when it's at max power? I have the brake settings set to Heavy Electric, currently.

Any suggestions for next steps? Thanks!

 

[Brutal_HO]

Stationary testing isn't really valid.

I don't have an answer for you otherwise, but there's some great technical info in this thread on our sister site HDRAMS:

Brake Controller Troubleshooting/Technical Info

This post is about the brake controller on the 2021 HD Ram. First, my story. Second some reverse engineering and description of the warnings on the dash. Finally, some technical details. I would assume this information would apply to other years in the same generation of truck, but outside of...

hdrams.com