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Yes, that's what was throwing me off- I wasn't waiting long enough for the oil pressure to build and for the generator to "flash". For anyone else wondering what I'm talking about, here's a youtube video that demonstrates the process: https://m.youtube.com/watch?v=mQgnuJPV9Gs

Aaand the problem was fixed by simply holding the main switch in "Start" position for a full 10 seconds. Thanks everyone!

Thank you all for your responses. I'm finally making the time to fully troubleshoot the problem. As a first effort, I swapped the voltage regulator for a new unit, which (surprise!) did not fix the issue. I'd like to specifically thank Guyfang for his posts and collected technical manuals - the...

Hello All I recently purchased a MEP-804A with 12 hours on a rebuild out of the Oregon National Guard depot. At first intermittently, and now constantly, the unit now only provides ~30-50VAC @ ~52hz on each leg, and the undervolt warning light is constantly on. I can increase the...