Generators, both 6v and 12v have served me well but I wouldn't touch one now for an important reason: I'm cheap. Just a regulator now will cost you more than an alternator with a built in regulator that has a lifetime warranty. The generator pulley will fit an alternator if it's needed to match crank and water pump and the mount bracket is easy to make or Speedway has them for $13 including bolts needed. Very durable with short rotor shaft, bearings at both ends plus more amps and better charging at idle or low speeds. Since your wiring looks shot an alternator is much easier to wire up.

Evan