Googling myself again, new results today. Saw this entry on Wikipedia:
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Tom Dalton was a lineman for an electric company until he was shocked and killed by 10,000 D.C. volts of electricity. He was brought back to life by a coworker, who used 10,000 A.C. volts. Tom Dalton became Magno. He was powered by the very electricity that saved his life, and he used it to fight crime with his magnetic and electrical abilities. He sometimes ran out of power and had to recharge himself by touching exposed wires. He was featured in Smash Comics #13-21.
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That's the secret right there, see. Reverse a killing by DC, with AC. It's so simple!
But you didn't think of it, did you? And that's why I'm a superhero and you're not.