My 10 HP 4500 watt portable generator wasn't working. I took it all apart and tested all the circuits. All of them tested good so I put it all back together. It still didn't generate any electric. So while it was running and I had my 1/2 inch electric drill plugged into it I pulled the trigger on the drill and turned the chuck by hand. That's all it took to excite the armature in the generator and it started to generate and my electric drill took off. The generator is working great now just like it use to. Glad that's all it was. I was starting the think I was going to have to scrap the generator or buy a new generator unit for my engine.