Onan Emerald Plus 4000 won't start

JandKSunshine wrote:
I haven't been able to find anything closer, though.

Go here: https://cumminsengines.com

Cummins now owns/makes the Onan generators and the name Onan is due to disappear on new production very soon.

Find a dealer near you. Call them with the model number.

They should be able to get you the right muffler; might even be able to have it shipped directly to your house.

It is important to have the right one......and to install it correctly....to prevent a carbon monoxide leak that can get inside the living quarters. If the muffler rusted out, the exhaust pipe might not be far behind.

Thanks, everyone! I think it was the battery. I plugged the RV into shore power, and was able to get it to turn over. A second problem was that it wasn't getting fuel - I found a break in one of the fuel lines, and that fixed the problem. It's running great now, with one exception - there's a hole in the muffler, and I'm thinking that's probably the reason for the loud backfire when I shut it off. Would that be a good assumption? Would anyone know where I can find a muffler for it? I'm having difficulty finding a part number. 155-1258 looks close, but the one I have doesn't have a pipe sticking out of the side. I haven't been able to find anything closer, though.

I have owned two motorhomes. One was connected to the house batteries and one to the chassis batteries so there is no single or correct or right way. It just depends on preference as there are reasons to do it either way. You just need to know how yours is connected and then operate accordingly.

You can bridge the chassis battery to it and try again..Press and hold the bridge battery with engine running...do that for at least 1 minute...then try again.

My guess, as well, is it's connected to house battery. Check that voltage and see what you get.

JandKSunshine wrote:
I just replaced the starter battery. I'm thinking that's the battery that starts the generator, too? Or am I wrong on that?
I'll try the connections next. I haven't tested the voltage at the starter yet.

Usually the house battery starts the generator. It usually charges BOTH batteries.

If you have a multimeter, check the voltage of the house battery. I'll bet it's about dead ;)

We can guess or you can use the troubleshooting guide from flightsystems
http://www.flightsystems.com/pdf/onan-rv-troubleshooting-guide.pdf

JandKSunshine wrote:
The battery was just replaced, so I know it has juice.

Without a quick test, at least a voltage measurement, you really don't know that for sure.

Was the new battery charged before being installed ?

Sure sounds like a battery or connection problem.

And no, the battery that starts the main engine is NOT the one that starts the generator. The "house" battery does that.

Sounds like a bad battery.

In our 2000 Country Coach the genset is started from the house battery. The start battery is dedicated to the main engine only.
There may be a momentary combiner switch on your dash that will combine the two sets of batteries while you try and start the genset.
Hope this helps...good luck!