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There can only be two possible explanations for the fact that you are now producing power after changing the diodes at A4. Either the diodes were already intermittently bad and they happened to operate properly during the battery test, or there is an intermittent issue at the VR circuit board...

Radio Shack lists a few different diodes from the 1N400x series, apparently topping out around 1N4004. The inventory finder for the Radio Shack's in my area all list the packages of 1N4004's as being in stock, so I guess this is a commonly stocked part at most (all???) Radio Shack's. Radio Shack...

On second look, at least one of those diodes appears to have its markings completely scorched away. Just change them. I'll try to find a part number for you when I get in tonight, unless someone else comes up with it. John

Part numbers or similar identifying markings should be legible on the remaining diodes, although you will probably need a magnifying glass. Alternatively, someone here on this board may have already done this research and identified the diodes, but a quick search I just made did not turn up...

The successful test with the battery, as outlined in the -34, proves a problem with the VR circuit board. If you have a decent meter that includes a capacitance test function, you can probably easily test the board components yourself. Absent such a meter, you can also examine the components...

Pull the cover from the side of the AC Reconnection box. The terminal block in question is literally just inside the box and probably the easiest area to work with. Locate position 5 and 6 on that terminal block. Disconnect the upper wire at 5 and 6. These go up to the VR circuit board. Wire up...

I'm not sure why you are obsessing about an inability to turn the voltage lower than 222 or higher than 260. If anything, the TM states that the adjustment range should be somewhat narrower than that. I forget the exact range and I don't have the TM open at the moment, but I recall that it is...

The VR circuit board actually has many individual circuits. The -12 and -34 plainly tell us that once the diesel engine comes up to speed and oil pressure is sufficient, releasing the start switch causes the VR to take control of the generator and control power production. This is where he has...

I respectfully disagree. Not all VR failures are of the higher than normal voltage variety. I think his next move should be to follow the test procedure on page 8-1 of the -34 manual. This test disconnects only the VR and substitutes a stable, nominal 12 volt DC source in its place. If he can...

Sounds like the AC voltage regulator is malfunctioning and not taking over. John