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Adjust the front panel voltage adjust so you get 120 v from a phase to neutral and see if the over voltage fault goes away.

Have you checked to be sure the voltage reconnect board nuts are all secure?

Sounds like a bum VR. I sell replacements if interested. They are in the Classifieds under Parts for sale.

Here is the 804's S1 Circuit Schedule for reference Basically S1-2,4,6,8 should have 24 volts on them all the time (Dead Crank in Normal and EPO switch pulled out) In PreHeat S1-1 should have 24 volts on it in Prime/Run Aux Fuel S1-3 & S1-5 should have 24 volts on them in Prime/Run S1-3 should...

TM Test Procedure for Libby VR.. 4-1.1 Testing (AC Voltage Regulator, P/N 01-21501-1, for MEP-804A/MEP-804B). a. Shut down generator set. b. Open output box access door. c. Note position of voltage reconnection terminal board and set FREQUENCY SELECT switch to 60 Hz position. d. Start...

The fast clicking will continue as long as S1 is in Prime/Run

Just be sure the end of the diode with the white stripe on it is attached to terminal 1 of the switch.

The 75902LV does not require any jumpers to be added to it. Simply put the diode across terminals 1 & 7 and then hook the wire harness wires up to the switch.

From what I've read one of the power stations on the island had a fire. When that happened it had a ripple effect and the entire grid went down across the island. They were able to get most of the power restored but some parts are still out. I've been in touch with a fellow S.S. member there...

Yes, the diode is required on the Electroswitch

Basically there are two components and their wiring that detect a Low Fuel fault. That being the Low Fuel Float switch and the A9 Float Switch module. The Low Fuel Float Switch FL1 is inside the fuel tank. It' comprised of 2 float switch's. The lower one FL1 detects a LOW Fuel situation. The...

The Hz meter won't work reliably unless the set is putting out 120 volts AC to the outlet.

4.2 is certainly shy of 5.0. Even at that the generator should be putting out somewhere near 120 volts at the convenience outlet if the VR is good. All things so far point to a bad VR. To double check, I assume you get around 120 volts AC at the convenience outlet with S1 in START, but then it...

It should have varied from around 0 to around 5,000 ohms. Was it generally in that range when rotating it from stop to stop? The meter may have read something like 4.98 K instead of 4,980 ohms for instance.

And 0 ohms resistance all the time when you disconnected wire 156A from the VR and then measure the RESISTANCE between wire 156A and terminal 2 of the VR while rotating the AC Voltage adjust knob?

OK, that would indicate a problem with either the wiring from VR terminals 1 & 2 to the voltage adjust potentiometer on the front panel or a problem with the voltage adjust potentiometer itself on the front panel. Just to re-verity. You measured 126.7 volts AC between VR terminals 3 & 4 with...

That's good. It indicates the exciter is working, flashing the gen head and the gen head stator is putting out AC voltage. That's not good. When you did the test did you disconnect wire 156A from the VR and then measure the RESISTANCE between wire 156A and terminal 2 of the VR while...

7.6 volts there is exactly correct. TM says "approximately 8 VDC". 7.6 VDC is what I measure on my good working set. Measuring 7.6 indicates the "flashing" circuit is working and you have continuity from there to the exciter and the exciter is receiving the voltage. What voltages and...

I have a NOS CHR10 C57410 EF that'll work for you. Just pay shipping and it's yours. "Paying it forward" since a SS member sent it to me fore zero

The blue device is a MOV Metal Oxide Varistor better known as a surge protector. It's there to help protect the VR from voltage spikes from the Quad Winding which can cause the VR to short out damaging the Quad winding. I have them available. PM me and I can send you one.