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How do I go about fixing a Schumacher 10/40/100/200 charger for 12v and 6v auto batteries? Answered

The cooling fan hums when unit is supposed to charge, so that has power. Which components do I check first and how?


Can't find any references to this unit. Is it fairly old ? Heavy ? Checked any fuses you can see ? Have you got a voltmeter to start poking about ?