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[1997CST]

Thought I read one place it was 3 phase

Millermatic 210 only came in Single phase.

[1997CST]

I you want quicker advice send me your phone # by email. I'll try to walk you through it in real time if you like
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[1997CST]

So if turn the key on your hour meter doesn't click? Not trying to start it? Check if you have 12vdc on one side of that meter. If you have 12 vdc I wonder if that ground from the meter is bad. That grounds that whole circuit.

[1997CST]

Even the blocking diode is good? How about R2? your problem is in SR2 or 3, or the capacitor. You need that exciter circuit for everything. Your problem is in there somewhere and if everything checks it sends me to the cap.

[1997CST]

It's a 2001 model Bobcat 250NT. A little more information would be great. What was the ohm measure between rings? Should be 3.2. Did you measure the OCV at the studs. Completely missing or just low? Check the fuses, Check the diode and look at the cap. Is the red dot still intact or is there a hole...

[1997CST]

My guess is that one or more SCR's aren't firing. Is the weld quality less than desirable? Splatter?...