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There are many possible reasons from stator output voltage to sensing, to fuel to control boards. A good place to start (as the unit does run) would be with the fuel system, if it has sat a long time it won't help. Also the fuel filter. try conencting to an external fuel tank versus the vehicles, as sometimes pick up tubes in main tanks can be an issue. Also check the correct oil level and viscosity / and oil pressure switch. Failing that I recommend a service center, as there really are so many causes, I cannot list all on here.
If the fuel filter (strainer) is OK, carb gives enough fuel for the load you apply, air filter is dry and clean, your problem may be the low oil level protection.
Check if generator is at level position. After the oil is distributed in all the engine its level may go less than the measuring sensor level. Try to put some more (not much) oil. If this will not help your measuring sensor may be bad and switch off when the oil gets hot.
Check the oil level or any other alarm that can stop it.
The switch may have lost its middle stable position and drop directly to stop. Try after you have the switch up for starting, let it easy back in middle position. If there it stops again. Try to move the switch down to "Stop". You should hear a click. If not replace the switch with the same type.
I have searched but cannot actually find what type male of battery it uses, other than it is a Lead Acid Battery. Now with lead Acid batteries, it is the actual Capacity, in Both Amperage output, and Physical capacity. So based upon that ANY 12 V DC Wet Cell battery of the SAME Physical size, and CURRENT capacity will work. Look on the actual battery itself, it WILL/Should have identifying marks written on it. Get one the same, it is NOT all that critical.
a 10 year old genset with only 45hrs on it...sound like the carb may need replace. working with these rv units for 6+ years has taught me that you cannot clean one well enough to fix it. you will need a new carb. your local onan dealer can help. when new the warrenty makes known that 1hr per month under load will keep the carb clean and problem free. evaporating gas leaves deposits and eventualy plug fuel jets. no replacement parts are recommended. i've personaly worked on rv's with 200+ hous and no issues at all. hope this helps, good luck...