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Allis Chalmers Discussion Forum
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12 volt conversion

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bleeding orange

08-13-2004 06:53:57




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I want to put an alternater on my 37 wc to make ita 12 volt system.I am told I need a one wire alternater with a self exciter.Where do the wires all go? Do I need a special on/off switch?Any advice helpfull!!




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Steve in N.J.

08-17-2004 15:35:53




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 Re: 12 volt conversion in reply to bleeding orange, 08-13-2004 06:53:57  
We offer a 12V conversion for AC machines. Comes in kit form, has all the poop ya need, along with step by step instructions and color coded diagram. We also carry in stock one wire Alternators, but if it's not a working tractor where it's used often, and running for long periods of time to charge the battery, a two wire would be much better. As Doug mentioned, most one wire Alternators need 1200-1400 rpm to excite the regulator to charge, where a two wire system immediately starts charging as soon as the engine starts. This would be much better for short runs, light duty, or an occasional parade to keep the battery reserve high. Drop us a line if you need information or help with your electrical system. Be happy to help you out....
Steve/B&B Custom Circuits
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Doug in OR

08-14-2004 10:07:16




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 Re: 12 volt conversion in reply to bleeding orange, 08-13-2004 06:53:57  
The one-wire alternator is a bit easier to install. This is saying that you need to only concern yourself with one wire, not two or three. Having said this, there are downsides to a one-wire installation. First of all, you need to spin the engine at a higher RPM to start the alternator charging. One-wire alternators are also more pricey. They are somewhat custom made and you won't find one in a junk yard - and even finding a rebuilt one will be difficult.

Personally, I'd go with a standard alternator. They just are not that much more difficult to install.

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steve(ill)

08-13-2004 18:26:27




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 Re: 12 volt conversion in reply to bleeding orange, 08-13-2004 06:53:57  
a one wire alternator connects to the + side of the battery thru the amp meter. you can do tht or you can get a regular automotive alternator. get one tht has an internal voltage regulator. a general motors DELCO built after 1975, or a newer HONDA or TOYOTA are good choices. the newer alternators are smaller and "fit" better. The alternators basically have a 8 or 10 gauge wire that is the charge wire, and a smaller 18 or 16 gauge wire that is the "excitation wire". this wire is normally a 12 volt supply from the key or toggle switch that is off when motor is off. i can give you a print if you wish, but this is the basics. I have used a DELCO 10SI from a 1975 truck, a DELCO C130 from a 1995 chevy and a MITSUBISHI from a 2000 japaneese car. all will work basically the same.
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