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Ford 9N, 2N & 8N Discussion Forum
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Re: 8N Ford 6Volt to 12 Volt Conversion

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Author  [Modern View]

12-11-2012 19:28:50

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Thanks soundguy and Dell.

The new 12V coil is a square coil like the original 6V. I was hoping it had a built-in resistor because the oem resistor is toast, but if I read you right soundguy, the oem resistor would do the trick if it was OK? My neighbour has an early 8N, so I can measure the resistance of its oem resistor and see how it compares to a resistor from a 1980 Dodge truck. I suppose I can run two of them in series if one isn't enough.

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12-12-2012 06:24:40

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 Re: 8N Ford 6Volt to 12 Volt Conversion in reply to Grabatire, 12-11-2012 19:28:50  
the oe resistor is commonly available.. get it. otherwise you will be playing hide and go seek matching up a fixed ressitor value.

new 2.5 ohm coil and old oe resistor tend to play well together.


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Dell (WA)

12-11-2012 19:59:19

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 Re: 8N Ford 6Volt to 12 Volt Conversion in reply to Grabatire, 12-11-2012 19:28:50  
grabbatire........NO....NO....NO......the "infamous ballast resistor" is a special kind of resistor that changes value with heat. It starts out about 0.5-ohms and as it heats up (inna'bout 2-mins) it INCREASES in value to about 2-ohms. This is something you can NOT measure with common ohm-meter. But you can measure the effect on the top of your 1-terminal squarecan ignition coil with yer VOLT meter. Ittza LAW, Ohms Law.

The "infamous ballast resistor" is like yer lightbulb, it either works or it don't. So iff'n yer tractor starts, guess what??? Yer ballast resistor is working. .........Dell, yer self-appointed sparkie-meister

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12-13-2012 04:47:53

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 Re: 8N Ford 6Volt to 12 Volt Conversion in reply to Dell (WA), 12-11-2012 19:59:19  
Where can I find the manual that has Ittza LAW Ohms chart ?

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12-13-2012 06:17:19

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 Re: 8N Ford 6Volt to 12 Volt Conversion in reply to Mimos, 12-13-2012 04:47:53  
Quoting Removed, click Modern View to seeSame place you get the "8 ways to convert & they all work first time" list. Elusive. :wink:

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