So I'm working on a parking brake issue on a 544H loader for a customer of mine. The park brake indicator light in the dash never illuminates. The machine just flashes "stop" when you move the shuttle shift lever to "forward" or "reverse" regardless of what position the park brake switch is in. I have 26 volts at the rocker switch in the dash and the switch seems to be working properly. But like I said, the indicator light never lights up and I can't get any power to the park brake solenoid. I do have power to the park brake sensor on the valve and it's getting back to the TCU. Just wondering if it needs a TCU or could something else be causing the issue. I never could find a relay for the park brake either, not even mentioned on the fuse box diagram.