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When the governor unloads at its set pressure, it sends system pressure to the small port on the bottom of the dryer. That applied pressure opens the purge valve on the bottom of the dryer To exhaust the collected moisture. There is a check valve in the top outlet port to the wet tank To keep...

With the grill off, thats easy then, peek up in front of the top of the radiator. There is a pass-thru located there. The pedal and the park valve vents are tied together behind the heater and vent thru that port When you let off of the pedal or set the park brakes. If for instance the pedal...

Look for air leaking away out the vent up in front of the radiator. That would indicate the treadle valve or park valve is leaking Draining away the system air…

You adjust the governor on top of the compressor, but you need to connect a gauge to the wet tank to adjust this accurately to 125. Procedure is in the manuals... The CTIS switch closes at 117, so the pressure may not be getting high enough to close the switch...

Have you reached 125PSI in the wet tank(brake service tanks)? CTIS will do nothing until it see enough pressure in the wet tank to close the pressure switch at the wet tank.