[Bryon Raymond]

My Howard system is relatively new but in-operable. I'll make an assumption that the inverter has to be in play for the sys to operate because the compressor motor must draw 110/120 V. When the eng is running, the inverter light on the dash is lit. Is it automatic? Also, I'm not getting a ready lite on the Howard controls. There is an inverter rocker switch on the instrument panel that has no effect on the dash inverter light. There is also an inverter switch on the panel in the hallway. What do these various inverters operate? This for you Michael. On the passenger side eng compartment bulkhead is three psi gauges, two adjustable and one not.
I believe one is for the tag air pressure. There is one to the eng side of the upper solenoids and I believe you said you thought that one was the cruise control. If so, it's indicating 80 psi. So I may have other issues to sort out.
I appreciate any input.