exhaust brake

I have a 2010 Hino 268 and my exhaust break come on when it feels like it or it has a short. My cruise control does not work any advise on issue I am having? Does this system have a fuse or replace then wire harness? Thanks

This thing has been acting this way for the last week. If you switch on the PTO, switch off the Exhaust Brake, hit the switch to idle it up, and let it sit there running 30-45 minutes, with no change in temperature, but the minute you hook onto something and start winching, the temp gauge...