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If the contacts close putting the two resistors in parallel the resistance should be 3.75 ohms.

On S8 be sure to spray the Deoxit in the opening by each screw on both sides of S8. This pic points out just two of the numerous spots to apply Deoxit. You can see the contacts in S8 through the openings if there isn't a wire lug in the way such as the opening by the left arrow. In that opening...

My money is on contacts 13 & 14. They are supposed to be closed in 120/240 mode putting R13 in parallel with R12. If they don't make good contact it'll cause the excessive voltages you are seeing between 3 & 4.

I'd suggest doing the following to narrow down if it's a K8 problem or a burden resistor or S6 or S8 switch contact issue. Running is 120/240 mode apply your 5,000 watt load. Then measure the AC voltage across K8 terminal pairs: 1 & 4 2 & 4 3 & 4 Each pair should have about 5.6 volts AC. This...

Close enough. My board measures the AC Frequency to measure the engine RPM. So, at no load the RPM should be about 3,050 RPM (254 Hz PMA Frequency). It adjusts the throttle to achieve the required RPM based on the Load signal from the inverter so that the engine RPM is correct for the load.

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I see in the pics and videos that somewhere in it's life someone cut the safety wires off the two mechanical governor adjustments. Not good... Those are adjusted at the factory and normally would not ever be messed with. Someone messed with those adjustments. In the short video the governor...

You may want to carefully verify the DCS is being provided +24 volts to the P2 plug on the back of the DCS. B+ pins should have +24 volts on them.

Check the fuse in the fuse/relay box to be sure the one for the DCS is there and good and that all the connectors to the fuse/relay box are connected.

Pretty close. Here is a link to a post I did a while back with waveforms from various MEP generators. Waveforms

Here are some waveforms I took of both my local utility power and of my 1030 under a 60% load. Utility Power 2.4% THD My 1030 Under 60% Load 2.6% THD

The Frequency gauge is a Current meter, not a Voltmeter. It's a 0-200 microamp gauge. So to display 60 Hz it would be supplied with 100 microamps from the frequency transducer.