can not start generator

I have a Holiday Rambler Imperial and will follow this thread close

Bad batteries shouldn't make the Generator shutdown when it is running, with no power to the switches, I assume you tested these with a voltmeter? Would indicate a fuse problem somewhere, or a burnt wire or transfer switch. Did you smell anything like burnt wiring? My Onan 7.5KW also quit like that, burnt wire on the transfer switch. My transfer switch was located in the electronics box under the fridge, wire was burnt in two, and transfer switch was toast.
Also on the left side of the Generator as you are looking at it, there is an inspection door, held on by two 10mm bolts, gen off, unplugged from shore power, take that inspection plate off and look at the terminal located below, mine was completely covered with corrosion I replaced the terminal block and renewed the connections and all my problems went away.
Jim

Pretty much every time someone tells us they replaced the batteries and now it won't work, it turns out the batteries are connected wrong.

Mine died on me when it was running, and ended up being the fuel pump.

Go to the switch outside on the Generator and push down on the bottom of the start switch and hold it there. You should here a clicking noise that is your fuel pump priming. If it is clicking then hold it down for 2 minutes and then try to start. You may have to try this a few times.

If there's no clicking noise odds are that your fuel pump is shot and needs to be replaced.