Diesel 6x4 No glow plug light or power to glow plugs

I know their was another thread on this but my issue is a little different.

I have a glow plug issue with my gator. The vin/serial is W006X4D033524. When I turn the key one click the light doesn’t light up on the dash. I have replaced the glow plug relay and now just replaced the coolant switch on the thermostat thinking that was it, but nothing has changed. Im stuck now, all I know is if I ground out the orange wire with the white strip that goes to the coolant switch the light on the dash comes on. Also all the fuses are good. Any suggestions on what to do next would be greatly appreciated.

Thanks