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I assume you have already checked for the obvious things: Fuel filter, air filter, linkage connected properly, popped circuit braekers/fuses, ect. If so, then... I would first check the output on the genset to see if you are getting the proper voltage. You would need a load bank to bench test the amperage. If your output voltage is correct, next you should check the restance on the magnet coils to see if it is shorted. If you don't suspect a problem with the magnet, try using another load on the genset such as an electric motor of the same voltage/current ratings of the magnet. If the engine loads up with this, you more than likely have a problem in the genset fuel system. Most of these are caused by dirty crudded up carbs on gasoline fueled engines. Onan carbs are realativly easy to clean depending upon the physical location and exact unit you have. One problem that shows up from time to time is a bad auto-idler unit. Depending on the age of this unit, it may be an electric solenoid or a vacuum solenoid, older ones used a fully mechanical system. Also, look to see if an auto choke is used on the unit. Some of these are electrical and some mechanical, I've seen these get messed up yet the engine will idle fine but as soon as a load is applied they will bog down the engine without producing smoke or misses. Please advise on what you find.
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