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Check the obvious, make sure the breaker is on, as this genset requires that breaker to be closed. Check to see if you have power on the generator / not laod side of the circuit breaker. If you do then the problem is the breaker, if not you need to dig deeper, and mesure the stator resisitance, most likely is the rotor excitation capacitor is open, this was common on those units, and will prevent excitation.
Sounds like the generator unit (sometimes called the generator head) has overheated and melted the insulation in the windings. This is the same as an electric motor "burning out", and if this is the case, then the generator is toast. If you happened to notice that the lights or fans were getting dim or slowing down before the breaker tripped (without the gas engine slowing down) then this is most likely the case and you generator is toast. But if the output just suddenly quit, then it is possible that some smaller electrical component has failed. In any case, it's not something external that you can easily reset or replace. Sorry for the bad news.
Your problem is with the electrical section of your product. Is it possible that your circuit breaker is flipping and cutting off the power? Have you tried plugging in to both of your outlets? Do both exhibit the same problem? All or nothing on all power outputs? If it's not circuit breaker related, it means your Alternator or power inverter is at fault and that's shop time! Nimsgame
check for open armature (check continuity at slip rings). Also check that diodes are good (not opened). Engine RPMs should be at least 1800 or 3600 depending on alternator. Probably 3600 RPM (for 60hz).
Also check to see if you have a bad circuit breaker.
If it's still under warranty take it back to the retailer and tell them it quit working - don't offer any other information.
If you must fix the E/G yourself - On the generator there's a cover on the back; take the cover off so that the back of the windings are exposed. You should see 4 to 6 diodes mounted to the rotor and stator...those diodes are most likely burned out because of temperature failure, due to overload. You have to take them out to isolate them...they should read .6 Ohms one way; reverse the leads and they slhould read about 1.2 Ohms. If there shorted you'll read 0 Ohms and open infinety.
Anyway, replace those diodes and you should re-establish your field winding voltage which develops you A/C output.
You need to trace out the power wires the come out of the genset. They will end up on a breaker. With a volt meter measure both sides of the breaker. If one side has voltage and the other side doesn't, then your breaker is opened. Press the breaker in closed to see if it actually closes. If it don't then you will need a breaker. However, if no voltage is being produced, it is possible that the voltage regulator let go.