An old Schumacher automobile battery charger has been used to charge the system auto batteries , for several years. One day, a couple of weeks ago, the charge went pffft. When I tried to plug the unit into the wall a grinding noise was heard. I took the thing apart. The construction was surprising. There are two button diodes used as rectifiers. One had shorted. I replaced both with standard through-hole tech diodes and reassembled the unit. Functional status restored.
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