The regulator is in the ECM on a 91.5-93. So the computer is removed from the equation. I disabled one contact with the install. Truck isn't home or I would take a pic. It may not be the same for the external 91 back trucks. So far it is doing good. Eventually I am going to go with a PA or similar 1 wire with the 200amp out put. Might be in need of more juice with the future plans which will not be mentioned at this time.