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MEP 805A Voltage bounces and runs high

Dave345

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I have an MEP 805A Iam attmepting to get operational;. I have cleaned and adjusted the MPU to (3 volts), replaced the broken VM-AM switch, got engine running.

The engine starts and runs, the generator excites, but the voltage bounces between 130 and 150 volts (in l1-l2 setting) with rheostat turned to lowest setting. The frequency in lowest rheostat position will only drop to 60.2 hertz. In max settings the voltage bounces between 150 and 180 volts with the frequency around 65 hertz. Adjusting the frequency rheostat increases and decreases the engine speed, but voltage still bounces. Manual has conflicting information regarding weather it is the AC regulator or the load measuring unit.

The generator has a Libby AC Voltage Regulator and a Woodward governor.
It appears that someone in the past has monkeyed with the governor , as the shielded cables are marked with black tape and paper tags.
 
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