I inherited a Kipor 2000 generator about three years ago. Anyway, I plugged in an appliance I think was 1500 watts. The engine ran fast for a bit with the smart throttle switch on and then back to slow and there was no electricity. The next day I tried it again and it produced electricity until I plugged in the same appliance. Since then it never produced any more electricity. The green light indicates it is producing electricity. I took off the panel where the recepticles are and there is no electricity coming from the wires attached to the recepticles. I do not see any fuze or circuit breakers anywhere. What is my next step to diagnose the problem?