A 3 wire alternator, properly installed.
Seriously, the only alternator I've ever had trouble with, in 40 years of working on cars, was the aftermarket, poorly designed, poorly implemented, poorly installed, poorly understood, poorly charging, often overused, 1 wire alternator.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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