can not start generator

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.

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.

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

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

Have you checked for fault codes? The Allison manual describes the procedure to display the fault code as a series of blinks on the generator start panel and how to read the blinks. In the version of the manual I have, fault code display is on the first page of the trouble shooting section.

phays wrote:
Have you checked for fault codes? The Allison manual describes the procedure to display the fault code as a series of blinks on the generator start panel and how to read the blinks. In the version of the manual I have, fault code display is on the first page of the trouble shooting section.

Assume you mean Onan manual.

It's not fuel. The batteries are hooked up correct. Eveything works except the geni. When you push either switch nothing happens no lightS no nothing..

If I understand your post the genset will not even crank over is that right? If that is the case I would jump your tow car directly to the starter and see if that will turn the engine over. It sounds to me that you are not getting enough amps to the starter to crank the eng. Could be a loose or coroded cable. If and alternate 12 v source starts the genset you know the problem is with the batteries or cables.

On the HR...the house batteries power the gen...you are saying gen gets nothing...follow the wires of the generator back to the batteries...I bet there is a plug loose or out that connects to the house batteries...almost sounds like a bad ground..

You sure your not below a 1/4 tank of gas when it stopped.