"mm" wrote in message
...

**The one in question today has 3 secondary windings,
green-yellow-green, red-red, and blue-blue. Does that indicate what
the output voltages should be?

Nope. There are no standards for that, only suggestions as to possible
colors.

http://tritium.fis.unb.br/Fis3Exp/fc.../transfor.html

and many more.