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The black knob should be set to the START position and locked there.

Sounds like you are using the pull start. Once it starts you need to move S1 briefly to Start and then release it. Then lift the actuator a bit to allow the manual start pin to pop out. Then slowly lower the actuator to allow the electronic governor to take over. Se the Manual Start plate on...

The voltages need to be taken across the terminal pairs such A & B, A & C, B & C. IE hook one meter probe to terminal A and the other to terminal B. 293 Hz is way to high a frequency/RPM for no load. You need to perform the Governor Adjustment procedure . It's in the 13&P TM. If you can't...

Something you should check is the AC voltage across terminals A & B on the Governor Controller behind the gauge panel. Do this with the engine running and no load applied. At no load the AC voltage should be about 178 volts AC. If your meter can measure frequency the AC frequency across those...

It's extremely hard to find working inverters for sale. I've never seen just the main board for sale. I could replace the SSR for you but no guarantee it's not another problem with the board causing it not close. @Dewie38 may have something though.

Based on those readings it would look like the problem is inside the Inverter. Specifically, there is a Solid-State Relay (SSR) K8 inside the Inverter isn't "closing" to enable the contactor to close and send power to the lugs. The problem could be with K8 or the circuitry in the inverter that...

Should one attempt to replace the K8 SSR to retain the the OL function?

Do the K8 SSR's go bad occasionally?

Has the contactor worked correctly in the past for you? The engine RPM won't change until there is a load applied. Without a load it's supposed to run at 3,050 RPM. At full load the RPM would be 3,450 RPM. I'd suggest making the following DC voltage measurements to narrow down the problem. 1)...

Have you done a Lamp Test of the Fault Monitor to verify all the lamps work? Are there any lamps illuminated on the Fault Monitor after you start it?