Why Is My Generator Producing Low Voltage?

Diesel generator voltage and frequency check during load testing

If your generator is producing voltage but the output is lower than its rated value, the most common causes include low engine speed, excessive load, incorrect AVR adjustment, AVR sensing problems, weak excitation, loose wiring, rotating diode failure, or alternator winding faults. In our experience, we do not start by adjusting or replacing the AVR. […]