Hold on now. I recently repaired a Mercury MK20H flywheel that had the magnets charged wrong. They were both North poles. It took two pulses.. One to remove the incorrect charge, and the second pulse on the charger restored the magnets to the correct polarity and strength. The first pulse on the charger actually neutralized on of the magnets. That was the incorrect one. In oeder for the charger to work correctly, the charger’s shoes must have intimate contact with the magnets. I generally keep the on button depressed for about three seconds, but that may be overkill as some magnets are able to be charged in an instant if the charging field is strong enough. It’s possible that some of the old chargers may have failed diodes in their workings, and therefore they would supply an AC field to the magnets. That’s how Demagnetizers work. Mine came to me with a half wave rectifier, and I changed that to full wave some time ago. The magnetic field it now produces is considerably stronger and more effective.

R.T.

Nope. Can’t post a picture. The engine was a customer’s, but it was just like any other Phelon flywheel that was used by Mercury in the 1950s. It had side by side Alnico magnets mounted with a small gap between them. The old wives’s tail that magnets can not be recharged or polarity reversed is hogwash. Completely discharged alnico magnets would typically be the result of flawed use of the magnet charger. R.T.