[Rich Biebel]

The control is an all in one PC board. It controls everything and is also the voltage regulator. There really is nothing else that would cause the voltage to max out. Unregulated they will show 150-160 volts. I would test it with no loads applied and use a load bank tester to apply various loads up to the rated max (33 amps) and see what it does. Most motorhomes have a connection box near the generator. Disconnect the generator at that box and tie my loadbank on right there. It would isolate the machine and remove any potential issue in an appliance as the cause for the voltage rise. Load banks are resistive testers. Just like a toaster. Those Controls do go bad and do all sorts of odd things. I have 2 4 KY's myself. Great machines in spite of some issues.