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Best guess is damage to the windings, the bad news is they are inside the engine, so your best alternative may be a 24V battery charger/maintainer connected to the AC output. Ike.

I just checked mine today, and am getting 44 VAC from terminals 3 to 4 with the regulator connected, no luck on finding my old charging regulator. Ike

I will look around tomorrow and see if I still have my old one, if you want it for testing purpose your welcome to it. Note mine would slowly ramp up to full voltage after a minute or two of running and cook the batteries. I think I threw it away, but not 100% sure. Will also check screw 3...

I think it is unique to the MEP-016b and its 400Hz and maybe its 28VDC only cousins. I know it is different from the MEP-002a and MEP-003a, not sure about the MEP-017a or MEP-018a, of course any parts for those two would likely be getting fairly old by now. Ike p.s. one word of warning if you...

each wire has a long alpha-numeric combination printed on them, these match the numbers on the old wires and on the wiring diagram (I think ones is something like F85, and other is 804A), the military spares no expense with things like custom printed wires, anyone else would put little A,B,C,D...

If it does turn out to be the battery charging regulator that is bad, there are new (built about 10 years ago) drop in replacements for sale on ebay for $100. Forum rules do not allow me to post a link to an ebay auction or buy it now, but you can find it by doing an ebay search for "libby...