The generator G-414 is a DC generator, 6V 10A 65-Watts.
Used in:
Ural M-62, M-63, M-66
Dnepr K-650, later K-750,K-750M, MB-750,MB-750M, MT-8, MT-9 and MT-12

It’s easy to let it run as a 12V powersource.
First you have to check if it’s running ok and provide at least 20V.

See: Generator check

Get yourself a suitable 12v regulator or use the Englisch hack to change a 6V regulator casing into a 12V regulator.