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For the 2nd panel you could install an isolation transformer, that would prevent the ground loop issue

For reference: I used the -12 manual to confirm i was looking at the right switch, then the -24p manual to identify the nsn of the part.

Try this...

Ebay is your friend. I can also look and see if i have a spare in my shop. If you apply 24v to the pump (preferably through the circuit breaker) and you hear it run the caps are still good

The problem is there is no protection (circuit breaker) So you can jump the pumps to power and they click? if thats the case then there is a wiring fault we need to dig into.

https://www.steelsoldiers.com/threads/all-the-tms-you-need-to-work-on-the-mep-003a.155936/ heres the link. Are you skilled on reading diagrams?

click the TM tab up top go to generator and electrical TMs about 4 pages in is all the TMs you need for the mep003 download the -12 tm (not the one ending in LO) and look at pdf page 53. thats the control diagram

I'm pretty sure it will. I believe the float deenergizes the valve

Also for reference I wouldn't run a wire directly from the battery to whatever you're testing because you're relying on absolutely no over current protection so if you have something badly shorted to ground you're going to find out very quickly and very burny. Just something to keep in mind

I've never seen a pump clog cause the circuit breaker trip. That is a classic sign of capacitor failure. Do this for me so I make sure that we're on the same page unplug the fuel pumps from the generator place the set in run and prime and two of those pumps should have 24 volts to chassis...

If they are actually bad, yes both. Why are you running a wire from the battery to the pump? Didn't you verify power to the pump quick disconnect? These are still available, but they can be quite costly. Not to mention the odds of all 3 failing together is slim.

Yes they are

This is on a 004 (my 003 isn't close by and I'm not motivated enough to put pants on to go to it). However same fuel pump. See the metal tube bolted to the chassis? That's the cap. Hope that helps

The switch should only click once per position you move it to, from what you described with 24 volt to the pump qd and no noise indicates a pump problem. A clogged pump may click very slowly. A gummed pump won't click at all. What you are hearing with the clicks is the plunger inside...

And 56% funnier Sent from my SM-S908U using Tapatalk

If you have 24volt at the quick disconnect wother the suppression capacitor is burnt out, the pump is jammed, or the pump is burnt out. The capacitor can be removed and bypassed (see Guys comment above). The pump needs further disassembly and cleaned Or pump needs replaced The...

Find the 2 main fuel pumps (one is to fill the tank). There is a quick disconnect, unplug it and see if you have 24 volts to chassis with the switch in run. If you have power pump needs help. No power we gotta dig deeper. Sent from my SM-S908U using Tapatalk

Know the feeling. Too many projects not enough time Sent from my SM-S908U using Tapatalk

Means your 120 loads aren't balanced. You're close enough to not worry about it. The neutral carries the unbalanced load back to the head. Sent from my SM-S908U using Tapatalk

Waves from Florida Can't be too careful these days. The problem is too many people don't know the risks. Sent from my SM-S908U using Tapatalk