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At first glance there are a few issues that come to mind. 1) Inadequate space for transformer based LF inverters 2) It would need to be compatible to accept the dual ~200V 3 phase power generated by the PMA. 3) The engine would probably need to run at full speed since there would be no feedback...

I got my hands on an inverter to tear into to locate where the TM K3, K6 & K8 are inside the inverter. My preliminary findings are.. K8 in the TM is K3 and Q7 on the main control board in inside the inverter K3 in the TM is K2 on the main control board in inside the inverter K6 in the TM is K5...

Yes you'll need a TRC A1 to work with that T1 Transformer and Voltage Adjust potentiometer. S12 is the Frequency Select Switch. It's on a panel behind the drop down gauge panel.

The MEP-804A and MEP-804B may have either the Libby A1 or a TRC A1. Depending on which is installed when the generator was built the correct R16, T1 and Voltage Adjust potentiometer are installed to match the A1. Since you have a Libby A1 then you need to check the following to be sure your...

You'll need to use a different MOV than the one used on the 802's and 803's due to the higher voltage that the TRC Voltage Regulator is powered by. The 802/803 VR gets powered by ~ 60 VAC whereas the TRC 804's regulator is powered with ~ 155 VAC. I'd recommend something like a MOV-20D241K It...

See post #4 and let us know what you get.

Yikes!!!! What a mess!

The "MOV mod" is not in any TM. It's a modification I suggested a few years back to be added to MEP-802A's and MEP-803A's. It's intent is to prevent voltage spikes from the their Quad Windings from damaging the Voltage Regulator. The "Fuse Mod" only protects the gen head from damage but does...

?? In Post #1 and Post #2 you said... Hello, is there anybody’s out there that can help me find a electronic governor control for a MEP 804B any help would be greatly appreciated Thanks Hello out there, I replaced A5 with the instructions provided unfortunately I still don’t get any power I...

Are you aware that the 804 used two different voltage regulators (VR)? Depending on which brand VR is used that the T1 Transformer, the R16 Resistor on the back of S12 and the front panel AV Voltage Adjust Potentiometer are different? Have you verified your set has the correct parts in it to...

Since you get power to the outlet with S1 in START it indicates the set if flashing and that the gen head should be OK. Now need to move on and see if there is an issue with the AC voltage regluation system. What brand of AC Voltage Regulator is in in it? Technology Research Corporation (TRC)...

Did you have power at the convenience outlet before you swapped the relays with S1 in START? With the relays swapped do you get power to the outlet with S1 in START and do you lose power there when you release S1 back to run?

That part of the job of the MPU. When the engine is up to speed and the MPU detects the RPM and causes the starter to be disabled. It also enables flashing at the same time.

Based on your measurements it indicates K15 is the problem. Odd because relays rarely fail. What should be happening is K15-7 gets 24 volts when the engine is up to speed. When you move S1 to START K15 closes and should pass the 24 volts on terminal 7 to terminal 4. However you are measuring 0...

OK Now with S1 in START measure the DC voltage at K15-7 K15-4 Also see if you see the K15 relay open and close as you move S1 from RUN to START and back to RUN while it's running.

OK now do these checks... With S1 in START measure the DC voltage at A5-18 A5-19 A5-20

All these tests must be done with the engine running. The MPU has to detect the engine is up to RPM before the field flash circuit can operate.

With S1 in START measure the DC voltage at A5-18 A5-19 A5-20

Now check K15 Terminal A then Terminal B with S1 held in start. A should be ~24 volts and B should be ~0 volts.

Was that with S1 held in START?