Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Have you checked the charging system? Do you have a voltmeter?
If you have a voltmeter we can check the charging system for proper AC and DC output from the stator and the voltage regulator. It definitely appears that you have one or the other giving you problems but with a voltmeter we can determine which one and get it repaired. The generac engine also has a small spade type fuse inline that could be blown that can also cause the charging system to not function properly. If you will look near the voltage regulator you should see a small black case, this case is the fuse holder, the cover or cap will snap open and you can inspect the fuse. This is a starting point to troubleshooting your charging problems.
When the engine is running your voltmeter should be reading between 14 - 15 VDC if everything is working properly.
With a voltmeter we could check the voltage output or the stator or alternator as well as the voltage regulator and then we could determine which one if either one was a problem.