Prodigy & Lockup
I recently installed a Prodigy and noticed that I cannot manually lock up my trailer brakes by operating the lever on the bottom of the unit, when the "Boost" is turned "off". I have the "boost" set to "b1" and this appears to make a difference. Because of this, I leave the "gain" set to Maximum and the "boost" set on "b1"and the amount of braking appears to be more than adequate.
Since this is an electronic controller, I surmise there might be some other things going on that I don't fully understand. I've noticed the power going to the trailer brakes (indicated by the Prodigy digital display"ramps" up, under normal operation. I think this to to prevent the brakes from locking up.
I have not had a chance to attach an external voltmeter to the Prodigy's power feed lead to see how much voltage is present, when the manual lever is operated. This would provide some indication of the voltage drop caused by the factory wiring. If it was significant, I think I would run separate "battery" and "ground" leads directly to one of the batteries.
I tow a 25' Holiday Rambler Alumascape, which I'd guess weighs somewhere around 6,500 lbs when loaded.
Good Luck!
Frank