Electrical & Power Output

Predator 3500 problems decoded: no power and the overload light, the “AC under voltage” code, and surging — what to reset, flash, test, and replace.

Generator overload light on with nothing plugged in? It’s not a load problem — here’s the reset, the inverter-board check, and when it’s worth fixing.

Generac generator won’t start or showing an error code? On portables it’s usually fuel; on standby units it’s often the battery, an RPM/overspeed code, or maintenance mode. Here’s how to read it.

No power from a capacitor-style generator? The run capacitor that excites the alternator may be dead. Here’s how to safely discharge, test, and replace a generator capacitor.

Generator producing no power or wrong voltage? The AVR (automatic voltage regulator) is a common cause. Here’s how to test it, rule out the brushes and windings, and replace it.

The decision tree starts with one test: does the breaker trip with nothing plugged in? Yes points to a bad breaker or internal short. No means overload or downstream fault — and 90% of calls land there.

Engine runs fine but the outlets are dead? Four suspects, four tests, four fixes. The free 12V flash-the-field procedure solves about a third of these cases with zero parts.