Flashing a generator—a process used to restore residual magnetism to the rotor's iron core when the alternator stops producing electricity—can be performed safely using a standard 12-volt automotive battery or drill battery. First, ensure the generator engine is turned completely off and all electrical loads are unplugged from the receptacles. Second, identify the positive and negative DC terminals or locate the specific brush leads behind the alternator cover. Third, take a pair of jumper wires, connect the positive battery terminal to the positive generator DC terminal (or brush), and briefly touch the negative jumper wire to the negative terminal for just two seconds. You can troubleshoot generator output safety safely by standing on dry ground and wearing insulating gloves. You can verify that your corrective action is successful when restarting the generator engine causes the alternator to excite its magnetic field, instantly restoring stable 120-volt AC power to the receptacles.
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