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S5 OPENS the contactor by breaking the connection between S5-2 and S5-3 when S5 is pushed down. 24 volts is supplied to K1-X when the generator is running. Once the contactor is closed the switch in the bottom of K1 below is closed (K1 11 to 12.) K1-11 remains grounded by the path of K1-11 to...

I've repair a few of the MEP Fault Indicator panels. Mostly 831 panels but a couple of 80x panels. The usual fault is one of the many SCR's on the board has failed. Usually shorting out causing a constant false fault.

Cable info from the -24 TM for cables from Contact to the lugs

Switch The cheapest I could find just now for it was about $40 ----> Switch

For test running it you could use a pair of basic SPDT switches. I posted up a while back a substitute switch for the OEM one. It required it to be wired slightly differently.

You are welcome to one of the take outs I have. Probably about $5 shipping.

Maybe they changed design at some point? The engine parts TM shows a "stick" Here are the ones I removed from an 831 I parted out recently

I'll defer to Guyfang and others on this one. If it were an electrical question, I'd be all over it.

To quote @Guyfang "The TM's for this gen set are not released to the unwashed masses. Its coded B and we can not post them here in the forum. "

Merry Christmas Everyone!

I was looking at a different revision of the TM. Sorry for the confusion. 122-3054 is the Libby VR 19870 is the TRC VR To determine it on your own you'd need to open the -24P TM and find the VR part numbers and the corresponding NSN number. Then go to the website Parttarget.com and put the...

See TM 9-6115-643-24 see section 4.1 The AC Voltage Regulation system is comprised of: - AC Voltage Regulator - Transformer T1 - Resistor R16 - Front Panel Voltage Adjust potentiometer Those 4 parts are unique and different for a TRC vs Libby system. Since you have TRC VR you would use 4-1.2...

Yes, essentially a direct replacement. Hook the wires back up to the same terminal numbers on the replacement VR. Install the provided pre-wired potentiometer in the front panel. Hook up two labeled wires behind the gauge panel. Done. As Guy posted above, the factory VRs fail frequently...

Step H - 7.2 V This verifies the Flashing Function is happening and you've got continuity to the static exciter and that it's working properly. Step J - 89.7 V This verifies the Quad Winding in the stator is good and providing the correct AC voltage to power the AC Voltage Regulator Step L -...

It could also be the Fault Monitor itself. They do go bad. Ditto on the A9 Float module. They go bad too. I'm working on something to replace the A9 Module, Float Switch assembly and Fuel Level sender. It's not ready to be sold yet. I need to do some tweeks to it and do some more testing.

The lower float on that assembly is for detecting a No Fuel situation. If the tank gets really low it trips the Low Fuel fault shutting the engine down. The upper float is for the Aux Fuel pump automatic operation. If you totally disconnect that assembly you will loose the ability of the...

Fuel tank switch? Which switch are you referring to?

As Light in the Dark indicated, download the Technical Manuals (TMs) from the forums TM section. Specifically, you need to perform the AC Voltage Regulator tests called out in the TM ending in -24. Post up the results of each test step and then we can guide you toward finding the cause. Be...

Here's a schematic I created a few years back of the factory VR Diodes D1 - D9 have dummy PN's by them. Component Ref Des may not match the factory VR. ** No guarantees this schematic is 100% correct. **

The Technical Manuals for the 804A are available for downloading from here---> 804A TMs Sounds like the VR or some other part of the VR syatem may have died. Do the AC VR tests called out in the -24 TM and post up the results of your measurements of each test step. The 804s used two different AC...