Using 2 alternators .....

C130 Chief said
Th trend in aviation has been away from 2nd alternators for a while. They may have been a necessary evil for those who wanted to fly a single engine aircraft in hard IMC, but now with modern avionics using so much less current and rapidly advancing battery technology, a second backup battery is typically used. Smaller, lighter, uses less power to operate and if the main alternator quits there's enough electrical endurance to operate avionics and FADEC well beyond the fuel endurance.

"Simplify and add lightness" was the design philosophy of a brilliant ex-RAF aircraft design engineer who went into the race car business after WWII. Colin Chapman was his name, and Lotus cars claimed a great many victories under him.

I haven’t seen any airplanes going away from two alternators. In fact I’ve installed 5 of these backup alternators in single engine airplanes that have been converted to “glass cockpits”. I’m currently installing a Plane Power generator to alternator conversion in a Beechcraft Baron. All of my customers want the latest trickiest avionics and plenty of backup power.