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Allis Chalmers Discussion Forum
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wiring

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george henson

09-21-2005 07:00:05




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i have a allis that i want to change over to 12 volt,i am putting a chevrolet alt with reg, how should i connect the wires?




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John T

09-21-2005 07:37:40




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 Re: wiring in reply to george henson, 09-21-2005 07:00:05  
George, is that alternator a GM 10 SI Model which has a built in regulator??? They have the big main BAT output on the rear and two lil No. 1 and No. 2 terminals on the side. If so let me know n I will tell you how to wire it. Also need to know of the tractor has a battery powered coil ignition or a Magneto??? Most alternators require Negative ground.

John T, retired electrical engineer



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Don Dittmar

09-21-2005 07:24:38




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 Re: wiring in reply to george henson, 09-21-2005 07:00:05  
If you are just changing to 12v neg ground all you need is a wire from the alt to the amp gauge, then from the amp gauge to the bat. I do believe you have to hook the amp gauge up backwards unless it is already deisgned for neg ground



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steve(ill)

09-21-2005 15:58:24




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 Re: wiring in reply to Don Dittmar, 09-21-2005 07:24:38  
if it is a CHEVY alternaotr from 1975 to 1985 era, it is a 10SI, will have two spade terminals on the side that are inline like this --, not parallel like this ll. If they are inline, tht is the internal voltage regulator type. the two terminals 1 and 2. 2 is always connected to the power lug that also goes to the amp meter. the 1 terminal is the signal that starts the charge. you normally have it switched on and off (12v) with the key or toggle switch. it is best to put a large resistor in line like a 10 ohm, 10 watt to drop the voltage slightly and get alternator to kick in and charge. i have a drawing if you need. if you have a mag, that is no problem. if you have a distributor, then you need to drop the 12 volt to 6 volt for the old coil, or get a newer 12 volt ignition coil. [email protected]

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