I have a 2001 F250 PSD and I noticed that my brake controller was no longer working the other day so I purchased a new one. When I went to install it I check the voltage in the factory wire harness for the brake controller and in the blue wire (trailer feed) I was getting 2.4 volts without hitting the brake and when hitting the brake I was only getting approximatly 6.3 volts (all with the truck running.) In the instructions for the brake controller it shows that I am suppose to have 12 volts when brake is pressed and to confirm we checked it on my dads Excursion and it was reading 11.9 volts pressed and 0 volts with no brake. I know there is an issue somewhere I just cant seem to find it and I was wondering whether anyone had any suggestions on how to troubleshoot or has had this issue before.

The brake contoller I purchased is Activator III 1-4 Axle Brake Control - #5520

heres the link to the thread i posted on the 7.3 section before I moved it here: https://www.ford-trucks.com/forums/9...ge-issues.html