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Great!!!!!!!!!!!!!!!!!!!!!!!!

Check again, JUST to be sure. Then make sure the wires are good. That the small connectors are still good. If you do not get any ohms reading again, scrape off some Insolation on each wire farther down, and test again. If that dont get it, you need a new one.

Sure. Open TM 9-6115-643-24, TM page # 2-304, or PDF reader page # 366. Start reading there, and everything you want to know about the MPU is there.

Old habits die hard.

Read this and then see if you can get it to stabilize. I would start from scratch. Check the MPU also, IAW the PDF

I have to move the frequency control more than I think it should. What do you mean here? Do you mean that you adjust it to 60, and a few seconds later you have to readjust it? Or 2-5 minuets later? Or several times an hour? how often and how much time between adjustments?

Then use the NSN in the TM, its the right one.

How often? How fast? Use the ATTACH FILES button down on the left side of the dialog box.

Can you post a film of the gauge during start up?

I would look up the NSN and plug it into Ebay. If no joy there, post a want add in the forum. Someone may have a take out on hand. Is yours with, or without in line fuse.

Measure between TB4-15 and K5-1. You should get 120 volts AC. If you do, then you need to reset the circuit breaker CB3. Or replace it. That's why I posted the schematic above.

Put the set in 60 hertz, and leave it there. If you have no ACV at the J1, go to TB4-15 and K5-1. Measure there for 120 VAC. What you got?

Why are you running in 50 Hertz? I have not lived in the States for a very long time. Has there been a change from 60 Hertz, to 50 Hertz?

I have an under voltage light on and the ac interrupter light and the battle short stay on. (All the time? Or as soon as you place the S1, (start switch) in the run position?) Or do they come on when you let the S1 go, during start up? I adjusted the hertz to 50, (will the hertz go higher?) and...