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Figuring Out Previous Owner's Alternator Wiring
#1376973 Mon Sep 14 2020 02:54 AM
Joined: Nov 2015
Posts: 34
Wrench Fetcher
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?

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20200913_223531.jpg (192.25 KB, 81 downloads)

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Re: Figuring Out Previous Owner's Alternator Wiring
Truckasaurus44 #1377012 Mon Sep 14 2020 04:11 PM
Joined: Dec 2002
Posts: 3,909
Moderator - The Electrical Bay and Rocky Mountain Bolters
This picture was just posted a couple days ago, it may or may not help.

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3-wire-better.jpg (10.21 KB, 60 downloads)
Last edited by Rusty Rod; Mon Sep 14 2020 04:11 PM.

Another quality post.

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Re: Figuring Out Previous Owner's Alternator Wiring
Truckasaurus44 #1377233 Wed Sep 16 2020 02:44 AM
Joined: Feb 2019
Posts: 1,182
AD Addict
I found this site to have real clear instructions. 12-VOLT NEGATIVE GROUND 3 WIRE INSTRUCTIONS []

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.

Last edited by Phak1; Wed Sep 16 2020 02:53 AM.


1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator

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