1 wire alternators

Because they sense voltage at their output and not elsewhere in the system. Why didn't the factory use 1-wire alternators? Because they suck. A great gimmick for the sort of mullet-headed Camaro driving knuckle dragger who thinks chrome valve covers make you go faster.

Why the hell would anybody want a 140 amp alternator? Trying to set a speed record for melting down your battery or wiring harness? Running a 9000# winch?

First, check the RPM needed to generate than output, you may find your regular 60 amp puts out more at the RPMs you typically drive at. Second, more output means more horsepower sucked up by the alternator. Why do a lot of racers shut off their alternators once they stage (which you can't do with a 1-wire)?