You may have overloaded it, and it may have been damaged.
Check your circuit breakers first. If there was an overload, they should have tripped if overload was long enough in duration and high enough in capacity.
If the breakers are good, then check your diodes and capacitor regulator in the end of the alternator. While you are here, check your brushes as well.
Do you have a manual for your generator?
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