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Allis Chalmers Discussion Forum
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6V to 12V Conversion Ignition Coil

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Triumph

09-27-2004 15:39:00




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Hello Everyone I converted a Allis WD 45 From 6V to 12V,I have one problem I burn up points very fast. I am told that this is because I have a coil that does not have an internal resistor. Does anyone have any part numbers or application information on a 12 Volt coil with an internal resistor? Thank You in Advance for your help Best regards




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Doug in OR

09-29-2004 19:49:04




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 Re: 6V to 12V Conversion Ignition Coil in reply to Triumph, 09-27-2004 15:39:00  
Put an ohmmeter across the two terminals (with the points open). With 12 volts, you should read about 3.2 ohms. With a 6 volt coil, you will read about 1.5 ohms. If you read 1.5 ohms, simply go to an auto parts store and get a 1.7 ohm ballast resistor. The ones for older MOPAR cars works just fine.

BTW, if you are running 12 volts directly to a 6 volt coil, the coil will get very hot too. Just another way to check.

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Dave Grubb

09-28-2004 13:16:47




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 Re: 6V to 12V Conversion Ignition Coil in reply to Triumph, 09-27-2004 15:39:00  
I use a NAPA # IC64SB. It has an internal resistor and makes for a neater installation. I also learned that if I use a 12 volt system condensor I didn't have a condensor short out about once a year. I know some guys will disagree but it worked out for me and another Wd owner I know of. I have since put in an electronic ignition system and have never looked back.



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steve(ill)

09-27-2004 19:53:42




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 Re: 6V to 12V Conversion Ignition Coil in reply to Triumph, 09-27-2004 15:39:00  
go to NAPA and tell them you converted to 12 volts. you have 2 options, get another coil, or add a dropping resistor in the line to put 6 volts to your original coil. NAPA can go either way.



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