Alternator Help...please

[Shawn Erwin]

Greetings Everyone,

I need help with my alternator. I have no idea what make it is but it is set up for a "one wire" application. I was anticipating a radiator fan upgrade and needed more juice and I had the alternator rebuilt to about 150 amps. Now the issue, at idle, the alternator is only maintaining 12 volts or lower. At driving speed, the system begins to charge all the way up to 13.7 to 14 volts. As you guys know this is a problem when running a dual radiator fan set up at a stop light in the summer with the lights on.

Another interesting thing is that there is another smaller wire running off a an alternator plug to the wiring harness. The female end of the plug has four pins and the wire is coming of the second pin. I have no idea what this wire is for - energizer wire? Everything that I have researched on current aftermarket one wire alternators don't need a separate wire coming going to the harness.

I have attached photos of the alternator, plug, and the small wire coming off of the alternator in hopes that someone can identify it and the purpose of the small wire.

Thanks in advance.

Cheers,
Shawn