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Allis Chalmers Discussion Forum
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wiring

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Travis A

09-03-2007 18:43:53




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I need to know where the wires from a 12- volt alternator, connect to in the ignition box, of a Allis Chambers WD?




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steve(ill)

09-04-2007 18:40:26




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 Re: wiring in reply to Travis A, 09-03-2007 18:43:53  
WD never had an alternator as factory, but anyway-- there are two terminals on the side of the alternator numbered 1 and 2. normally #2 is jumpered to the 12 volt hot wire on the back of the alternator. the 31 is the signal wire to get it to charge, you put a 10 ohm resistor in the line and run it to the on-off switch or key switch so it has 12 volts when running, and nothing when motor is off. some use a light bulb or diode in place of the resistor.

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Travis A

09-05-2007 06:06:52




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 Re: wiring in reply to steve(ill), 09-04-2007 18:40:26  
Is where u wire the Alternator to the ignition box different on a model with a key start, rather than one where u turn the key, and pull the lever?



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stu (ON)

09-05-2007 06:52:08




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 Re: wiring in reply to Travis A, 09-05-2007 06:06:52  
Not according to the first two diagrams on Duey's page.



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stu (ON)

09-05-2007 06:54:10




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 Re: wiring in reply to stu (ON), 09-05-2007 06:52:08  
Correction: should say "yes" according to Duey's Page



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Travis A

09-05-2007 08:05:35




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 Re: wiring in reply to stu (ON), 09-05-2007 06:54:10  
Thats where i have the problem, I dont no exactly wher the wires hook to in the ignition box...on the ampeter, ignition switch, and light switch..



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stu (ON)

09-05-2007 10:25:12




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 Re: wiring in reply to Travis A, 09-05-2007 08:05:35  
I don't have the full electrical system on my WD anymore. But, look at Duey's diagram and start at the battery and work backward. Have you converted the battery from 6V positive ground to 12V negative ground? You should then have a heavy battery cable running from the positive battery terminal to the hot connection on the starter. An insulated wire should also run from this hot terminal to one side of the ammeter.

Do you have that part figured out? Also, you don't say if you have a magneto or distributor. I think that you have to abandon the old two-position light switch when you go to 12V alternator. Or at least bypass the old resistor circuit that originally came in the metal box to provide low charge from the orignal voltage cut-out.

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Travis A

09-05-2007 11:22:51




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 Re: wiring in reply to stu (ON), 09-05-2007 10:25:12  
Thanx..and it has a distrbutor, not a magneto..the las owner swapped out the generator, for a 12 volt alternator..so the engine would start eaiser..So do I need to install a new (toggle switch) for the lights...?



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stu (ON)

09-05-2007 11:48:50




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 Re: wiring in reply to Travis A, 09-05-2007 11:22:51  
To summarize, you have a mechanical pull rod to the starter, 12V battery, negative ground, distributor & coil ignition.


Do you have an internally regulated alternator? If so, does it have three wire terminals, or just one. The common conversion is to three-wire with a shunt from the sensing terminal to the battery terminal on the alternator. If it is, look at Bob's drawing in the link and see if you can hook yours up this way.

I don't know if you need to get a new light switch. I would think that you could find a way to just convert an original to "on-off" function. You would need an ohm-meter or 12V test light to confirm that you are using the right terminals.

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stu (ON)

09-04-2007 04:12:38




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 Re: wiring in reply to Travis A, 09-03-2007 18:43:53  
This might help.



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