Yes, you can easily remagnetize a portable generator—commonly referred to as "flashing the field"—when the alternator loses its residual magnetism and fails to produce electricity while the engine is running. Over time, vibration, prolonged storage, or a lightning strike nearby can cause the iron rotor core to lose its magnetic charge. By temporarily applying a 12-volt DC current from an external battery directly to the rotor brushes or DC output terminals for a couple of seconds, you realign the magnetic domains. You can troubleshoot alternator magnetism safety safely by shutting off the engine completely before handling internal wires. You can verify that your corrective action is successful when flashing the field and restarting the generator engine immediately restores stable 120-volt AC output voltage at the receptacle panel.
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