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I would recommend a generator of the right type and size to do the job. Paralleling two 804s then using them as single phase is not optimal. If you go with the advised derating you will be around 16kw continuous out of two generators. I'm sure you can find a civilian generator in the 20kw...

In.

Before you do anything else get the top off of it and inspect the entire area behind that switch. A missing knob and screws are big red flags. Also the quad fuse is a modification that was performed later to protect the exciter windings from damage in case the voltage regulator fails. Later...

Search eBay for ct100d24c1s and you'll find it.

Have you tried a horse stall mat?

The gear looks to still be here so that may be me. :p

Have MEPs... Will travel...

That goes without saying. ;)

I got about 50lbs of rice in the house and a yard full of MEPs. We should be good. The rice has nothing to do with the current viral situation though. Its just evidence that I'm married to a Chinese woman. :D

Nice job!

You can upgrade to the aftermarket VR that is made by one of the members here. That would be the a simpler solution that would also increase reliability. https://www.steelsoldiers.com/threads/ac-and-dc-voltage-regulators-for-mep-002a-and-mep-003a.176549/

Time to break out the volt meter and start looking for the location of the breakdown. The schematic has the terminal info for S1. You can see if you have voltage coming in and if not trace back through the wiring till you find the problem. Edit - For some reason I didn't see the replies on P2...

OK. Kurt should be able to give you some pointers as to what to check.

Well... I've noticed on a few units that this is the first symptoms of the speed controller failing. As a test you can try to adjust the tuning pots on the controller and see if that does anything. I had one go down that road and the speed control became more and more erratic until it would...

No throttle cable on these. The throttle is servo controlled. Also the output power is via an inverter so not directly connected to the alternator. If the voltage is going up and down with engine RPM its either a bad inverter, bad voltage pot, or wiring problem between them.

Has the unit operated correctly in the past and this is a new problem? Have you traced out the wires between the voltage POT and the inverter?

Pull it apart and let us know what you find.

Certainly sounds like a short. Where did you see the sparks coming from? Have you taken the top covers off and inspected the wiring?

If you ever want to upgrade the units you might consider one of the inverter based ACs. I can easily start mine with the 831. Its a 14kbtu 120v unit. Really energy efficient too! I run it in the summer time off the solar setup. It was a bit over $500.

What kind of AC units are they?