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Allis Chalmers Discussion Forum
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WC 12 volt conversion

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48C-MAN

04-30-2014 10:40:16




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I am converting my 6v pos ground to a 12v neg ground. It has a ignition switch and solenoid not the oe rocker. Should I change the solenoid or any of the wiring for the ignition along with the regular items (coil batt gen light bulbs etc)? Thanks for any help with this.




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steve(ill)

05-01-2014 15:18:14




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 Re: WC 12 volt conversion in reply to 48C-MAN, 04-30-2014 10:40:16  
New solenoid and 12v coil would be a good idea. Old 6 v generator had a cutout ? NEw 12 v needs a voltage regulator and an extra wire or two..



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John T

05-01-2014 06:34:10




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 Re: WC 12 volt conversion in reply to 48C-MAN, 04-30-2014 10:40:16  
Since the solenoid isn't engaged and drawing excess current (due to twice the voltage applied) for a very long time, it "could" maybe might lol last a long time. However, it would be easy to add a series voltage dropping power rated resistor in series to reduce the 12 volts down to 6 orrrrrrrrrr fairly cheap n easy to just get a 12 volt solenoid if and when an old 6 volt burned out.

If changing polarity the coil polarity also needs to be changed as well as any ammeter leads so it dont read bass ackwards.

You can EITHER add a series voltage dropping (12 down to 6) Ballast Resistor to the 6 volt coil OR get a new full true 12 volt coil no ballast required

The old 6 volt starter will work and still turn same direction regardless of polarity, however, it can be a bit tougher on starter drives/gears etc when using 12 volts on a 6 volt starter. Ive done that with no problems however and dont let them crank on and on and on to risk overheating.

John T

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