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OK I just looked it up. The diodes used in the 002A and 003A generators are rated at 12 amps and 400 volts. Any diode of the same or greater ratings can be used as replacements as long as they "fit" in the allotted space and as long as they will bolt up to the heat sink. Remember some of the...

Thanks Chainbreaker. They are just common stud mounted diodes. Normally the stud mounted end is the cathode. The R in the top one means REVERSED configuration where the stud is the anode. I think I can take it from here.

No numbers that I can find. Having been in electronics all my life I imagine from the application that these stud mounted diodes are just generic diodes that can be purchased for a few dollars each. All I really need to know is the amp rating. Most any 1000 PIV stud mount diode should work as...

UPDATE - After installing a new "reconnect box', replacing Q3 on the ACVR, installing a new ACVR, checking T1 and T2, then replacing the entire "gauge box" with a good one, and checking all grounds etc with no success, I took a break. All this tells me the problem must be in the generator...

I never intended to "insult" anybody, especially those who are trying to help. All I meant is I have numerous VOM's and no one is best for all jobs. Actually I prefer analog VOM's but digital VOM's definitely have their place. A good digital VOM is probably best for reading a stable voltage...

Thanks - I have been a ham radio operator since the 1960's. I have built some of my own gear and I do a LOT of troubleshooting and repairs for other hams. However this 002A is getting the best of me. I really think the problem is a shorted winding OR a winding that checks OK with a volt-ohm...

Thanks - The test meter is Fluke 87 IV which is very accurate. It reads AC voltage and Hz. I do have a couple of working 002A generators that I can swap some parts off. If the AC VR from triplejim does not solve the problem I may have to resort to part swapping.

Posting a little more info in hopes somebody can offer some suggestions......As stated in the original post my friend has owned this 002A for 2 years. The voltage has always been unstable jumping from 240V to 310V and back several times in a typical 30 minute exercise run. I offered to try to...

For the past 2 years a friend has owned a MEP 002A with unstable output voltage. It was like that when he bought it. The reconnect switch has always been in the 120/240 single phase position. When started the output sometimes is 120/240 and sometimes it is 155/310. During a typical 30 minute...