Running a converted alternator

I am going to say "likely not"

First that diagram is from the MAD article conerning problems with over-loaded electrical systems and the ammeter/ bulkhead connector, read:

Catalog

Second, a 'one wire' alternator gets it's sensing voltage FROM IT'S ONLY ONE WIRE. This means that if the wire is undersized, has poor connections in it's path to the battery, and/ or is operating a lot of load like pumps, fans, etc, the voltage will run LOW to the battery

Normally, a 'one wire' alternator requires MUCH larger charging wire than does conventional systems with external sensing.

What is the rated current of your alternator? 60A or so, I'd use at least no8 wire from alternator to battery, with an appropriate fuse/ link/ breaker, and larger than 60A step it up to no6 wire