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The charging when you are using the generator is accomplished by your converter or inverter/charger. That has a breaker on it and it can be the breaker(s) on the genset might be tripped. IF you are getting other 120 VAC uses on the genset, those may be fine. The inverter/charger usually has either push button resets or a light switch style breaker. Check your manuals for those instructions. Hope that helps here. Please get back to me if you need more on this or we need to dig deeper into the problem. All follow ups are included in our fee.
Just checking back to see if you need some additional input from me here? If you provide the model designation I can supply some wiring diagrams and further instructions on testing this.