USAF FL-1D No output power

[oldtruck51]

Picked up floodlight genset but it has no output power. I have flashed field and restarted, no change. When I leave field flashed with 12v and start unit I get 108-110v to outlet plugs. Reattach field wires to Voltage regulator and start, still no output power. Replaced voltage regulator, same problem. I pulled generator apart and had bridge rectifiers replaced. Put back together and exact same issue. I'm wondering has the rotor been damaged that it is unable to hold residual magnetism? Exciter and stator tested, no apparent problems. Has anyone else had this problem?
Any help would be appreciated.
Thanks.

 

[Guyfang]

You need to measure at F1 and F2 wires, for voltage when you start up the engine. The Main Gen needs Initial Excitation, before it can produce power. So check that first to see it it is in fact happening.