Originally Posted by BuddyRay
I verified the following:
On a 2015 F150 with Integrated controller and "intensity" set to HIGH, a Gain setting of 10 does produce 10v on pin 2.
Based on my old TT which would lock the brakes up at about 2.5 volts, that's a lot of power. SO I now believe the problem with weak brakes is in the Jayco.
In any event - I think I now have enough data for a trip to the Dealer.
Keep in mind that electric trailer brakes do not work purely on voltage.
The signal to the brake magnets is adjusted using Pulse-Width-Modulation.
A full 13-14V (as supplied by the alternator), 10+Amps (available) is sent as a square wave with an adjusted duty cycle. 10% on, 90% off = very weak braking. 50/50=moderate braking. 100% = Full braking.
Trying to measure the DC Volts of that signal will get you nowhere very quickly. An oscilloscope will give you much more useful information.
Also keep in mind that automakers are in the ABS mindset right now. Total lockup of any brakes is unacceptable.
On the other hand, when I replaced the axle in my first TT, I found the wires to the brakes had been pinched under one of the U-bolts holding the axle to the spring, shorting both to ground. The original owner must've gone nuts trying to get the brakes to work properly (I found evidence of at least 4 magnet changes). After the axle swap, I could adjust the brake controller so the trailer handled it's own mass very nicely.
So, you are pretty sure you have a problem.
Did you try pulling the breakaway yet? See if it is a controller issue or a trailer issue.