I thought of this way back when the rig was returned, and I discovered the high stop not working. I have indeed disconnected the high stop, and put another power source to the ballast. It works just fine. I then disconnected the ballast, and tested the brake circuit. It failed, and blew the fuse (#13). That post was made way back when the rig was returned in Jan or Feb 2018. The circuits are the same for the high stop from 95 to 98 I believe.
The circuit is grounding either at the C212 where C10 becomes C511, C511 becomes C569, or a mismatch pin placement in C212. A current belief (by the installer) is that C511 brake circuit, is grounded to the one touch power module at C212. I disconnected the door jamb can to test this, and the fuse didn't blow when depressing the pedal.
After seeing that circuit C511 goes directly to the GEM, and is powered by C10 from the fuse panel, I'm not entirely convinced the issue is at C212 yet. Waiting on a response for the installer on his thoughts are and a possible fix for this.
A few other tests was done to rule out other bad parts. Cruise does not work as it knows the C511 is not right. Hazard flasher was tested, found good. Gem was tested for ground, and found good. The other BPP circuits was tested for ground, and found good. It is just this C511 from the pedal out that is bad.
Sorry, my head hurts now. I'm out.