How can I remagnetize a generator?

Remagnetizing or flashing a portable generator's field windings to recover lost electrical output requires applying a temporary external DC voltage source to the rotor. First, shut down the generator engine completely and disconnect all electrical devices from the AC outlets. Second, access the generator's brush holder or DC output terminals. Third, connect a 12-volt battery or drill battery to the terminals by running a wire from the positive battery post to the positive generator brush terminal, and briefly touching a second wire from the negative battery post to the negative brush terminal for one to two seconds, creating a small spark. You can troubleshoot electrical flashing safety safely by ensuring the engine is completely dead before touching internal components. You can verify that your corrective action is successful when restarting the generator engine restores the magnetic field and produces a steady 120-volt AC output at the panel receptacles.