How to Troubleshoot your Voltage Regulator with a 9V Battery

This trick will help you determine if it is the voltage regulator or if it is something else major.

1. Check the voltage on your main stator – ensure its reading at least residual voltage which is around 30V (>10V)
2. Find your Voltage Regulator in the generator set (usually behind the control panel or in the generator end dog house)
3. Locate your two exciter field wires usually labeled F1 & F2; F+ & F-; or + & –
4. With the generator set running hook up your + & – to the 9V battery while still reading the voltage on your main stator with a mulitmeter
5. We should see the voltage jump up to somewhere around your rated voltage (240V in this video). If it does, your voltage regulator is probably bad …
6. If the voltage does not jump up, and you are sure you have the right exciter wires, you probably have a different problem in the generator end…