Stovebolt.com Forums The Shop Area The Electrical Bay Figuring Out Previous Owner's Alternator Wiring

I've got a 1953 2-ton that was converted to 12V by the previous owner. He also put in a new wiring harness. The alternator isn't charging now and I fugured to just replace the 1-wire unit he had in there with a another. Then I noticed the plug that appears to be for a three wire unit zip tied off to the side. See picture below.

One wire on the plug disappears into the harness. The other just has an eyelet on the end of a short wire. I believe that eyelet goes to the battery wire stud, but not sure. What should I do? Stick with 1-wire or use the plug on a 3-wire. If I use the plug, does that eyelet go to the charging stud on the alternator?

This picture was just posted a couple days ago, it may or may not help.

I found this site to have real clear instructions. 12-VOLT NEGATIVE GROUND 3 WIRE INSTRUCTIONS [vintageautogarage.com]

The Idiot light is nice to have, but can be eliminated from the wire going to the ignition or to the ignition side of the ballast resister.

Personally I would install it.