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Allis Chalmers CA with 12V conversion wiring

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05-02-2008 04:21:57

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I am working on an AC CA for my neighbor & do not have the wiring diagram of how a 12V alternator connects to the tractor. The alternator has 3 connections (1, 2, and +) and is a Delco Remy. Any help would be appreciated

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Kentb of SWMO

05-02-2008 05:40:16

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 Re: Allis Chalmers CA with 12V conversion wiring in reply to mez6266, 05-02-2008 04:21:57  
About any general car repair manuel from the 70's will have the diaghram in it, but the wiring is relativly simple. The post on the alternator should go directly to the load side of the amp meter if an amp meter is beening used. If no amp meter go directly to the plus side of the battery with at least a 12 gauge wire. 10 gauge would be better. The next terminal to the right looking from the back of the alternator needs to go to a switch 12 volt line from the ignition switch. This line needs a 10 ohm 7 1/4 watt resistor, 10 ohm 10 watt will work, or a diode with the band on the diode TOWARD the alternator. Why you need the resistor or the diode is where a vehical with battery ignniton will die when the ignition switch is turned off. The next terminal to the right need to be connected to 12 Volt. This connection is the regulator "sense line" This is the voltage the regulator "looks at" to determine the batteries charge. Many people connect this wire to the post on the alternator. This will work and GM did this in later years BUT electrically it is NOT really right as when the alternator is charging there is a voltage drop in the heavy wire. If the wire is connected to the post the regulator will be seeing alternator voltage not battery voltage. There will be a few tens of a volt differance. I always connect this wire to the battery. It will take two or three extra feet of wire to wire it this way but it is really the correct way.


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05-02-2008 07:28:10

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 Re: Allis Chalmers CA with 12V conversion wiring in reply to Kentb of SWMO, 05-02-2008 05:40:16  
Thank you

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