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OK, so the control winding of CVT1 looks good. Everything is pointing to the regulator board. You did say it's an intermittent problem, which means you might have just caught CVT1 when it was behaving. Therefore it's not a 100% certainty unless you swap it with the one in your other...
Read my last post please. You're on the wrong transformer. You're measuring "1C" and "2C" of CT1 when you need to be on "C1" and "C2" of CVT1.
Note that the diagram label "front" is away from you when you're looking in the enclosure. C1, X2, and C1 are nearest CT1.
I just went out to my MEP-003A and looked. You're on CT1. CVT1 is the one that's away from where you're sitting when you look at the pair. CT1 should have "CT1" molded into the housing facing you. That's the wrong one.
Put those wires back on and find C1 and C2 on CVT1. I found a diagram...
That photo shows you measuring the resistance at the wires. You need to measure it on the C1 and C2 terminals on the transformer. You're checking the transformer winding.
You already checked T1 and T2, but they're located in the main control cabinet. Terminals 10 and 11 are the output of T2, and terminals 15 and 16 are the output of T1.
It looks like it's down to either the regulator or CVT1. Did you check the resistance between C1 and C2 of CVT1 to see if...
You might also verify that T1 and T2 in the control box are working. One supplies the regulation current to the regulator board, and the other supplies a sample of the generator output to the regulator. If either one fails, the generator output will go high. Here are the voltages on the...
Bob, for some reason the output is not being regulated. From your description it seems like the full output of CVT1's X windings is being rectified by diode board A4 and being sent to the exciter field. This could happen if CVT1's control winding has a problem, or if the regulator is unable...