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That can be that the battery is hasn't got any real power due to a failed cell. Load testing is the only way to know for sure. That is most likely the problem, but if that checks out, then it is most likely the starter solenoid that isn't passing the current across. That can be tested with a 12 VDC test light. IF you hear a distinctive "click" at the solenoid once you know the battery is good, then that is the next logical step. Be sure that the ground lead off the genset is clean where it attaches to the frame. That would cause this as well. Hope this proves helpful here. Please get back t me if you need more on this as all follow ups are included in our fee.