We have a 2003 Monaco Executive with a generator start problem. I am able to start it by running the engine for 45 minutes and using the battery booster. The chassis and house batteries read high 13's to low 14's. We had the generator checked over in May at a Onan dealership in San Antonio. They charged $250 to tell us it started by using the booster( a 10 minute fix) Any ideas?Wife of owner

I am thinking it could be loosing fuel pressure between the pump and the injectors. Enough cranking and fuel is finally getting into the cylinders. It could be weak fuel pump.

Something is wrong with your battery or cables. You charge the battery for 45 min and then use the boost? If my house battery is dead I push the boost button and start the generator, you shouldn't have to wait for it to crank over.

I think I am reading OPs post wrong.Does the genset turn over at all without the boost? If no, you have a problem in wiring between that battery and the genset. Does this genset have a pre-heat for the start-up? If yes, could be issue with that system sucking the battery voltage down.

enblethen wrote:I think I am reading OPs post wrong.Does the genset turn over at all without the boost? If no, you have a problem in wiring between that battery and the genset. Does this genset have a pre-heat for the start-up? If yes, could be issue with that system sucking the battery voltage down.Our genset starts off the truck battery, if your having issues cranking, would be checking both the positive cables ends as well as a poor ground leads, making sure they are all clean and the wire is not rotted inside from battery acid. there should also be a ground strap from the genset to the base of the generator as well too to check.

The generator cranks over fine, it just won't fire up. We replaced the house batteries in February, could there be something wrong with them?The Wife

Onan mobile Gen Set HDCAB/HDCAA start problem | Good Sam Community

77rollalong
Explorer
Sep 26, 2018
enblethen wrote:
I think I am reading OPs post wrong.
Does the genset turn over at all without the boost? If no, you have a problem in wiring between that battery and the genset.
Does this genset have a pre-heat for the start-up? If yes, could be issue with that system sucking the battery voltage down.

Our genset starts off the truck battery, if your having issues cranking, would be checking both the positive cables ends as well as a poor ground leads, making sure they are all clean and the wire is not rotted inside from battery acid. there should also be a ground strap from the genset to the base of the generator as well too to check.
enblethen
Nomad
Sep 26, 2018
I think I am reading OPs post wrong.
Does the genset turn over at all without the boost? If no, you have a problem in wiring between that battery and the genset.
Does this genset have a pre-heat for the start-up? If yes, could be issue with that system sucking the battery voltage down.
K_Charles
Explorer
Sep 26, 2018
Something is wrong with your battery or cables. You charge the battery for 45 min and then use the boost? If my house battery is dead I push the boost button and start the generator, you shouldn't have to wait for it to crank over.
enblethen
Nomad
Sep 26, 2018
I am thinking it could be loosing fuel pressure between the pump and the injectors. Enough cranking and fuel is finally getting into the cylinders.
It could be weak fuel pump.

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Onan mobile Gen Set HDCAB/HDCAA start problem

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