Original issue was truck would start bucking like a bonco. Lights was the DSC, Brake, and the other one that is red with tilt type arrows, which I think is suspension would come on including the Battery light.

Was getting sporadic readings off the alternator so I replaced it. Battery light cleared and all seemed well.

Then the brake, DSC and the other light which I think is suspension came on and the truck started bucking like a bronco again.

Replaced the Brake pedal switch and it was good for about a day or two but then it started bucking like a bronco again.

Any ideas? I thought I read something about a wiring harness somewhere that can cause the issue

 

Need the codes and a better description of what is shown on the information screen besides the bucking bronco description. Sounds like a suspension fault that is putting you in access height.

 

It was a corroded harness in the passenger side rear tail light. Weird. Why does braking system have that kind of affect?

 

Because Rover.... There is some severe broken logic that anything brake like related would impact so many systems. I can see it being an issue with some, like ABS or stability. Since the vehicle may not know if you are using the brake or not. But how it takes down the air is beyond me.... At least you found the issue! I would have never guessed.