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Ford 9N, 2N & 8N Discussion Forum
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12 or 6 volt coil

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Joe House

08-21-2005 07:38:06




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My 8N has a 12 volt system but I am not sure wether the coil is a 12 volt or a 6 volt with resistors. If I connect a digital volt meter on a low DC volt setting to the battery lead to the top of the coil and start the motor will that let me know which one it is? (a 6 volt reading for a six volt coil and a 12 volt reading for a 12 volt coil)
Joe




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Dell (WA)

08-21-2005 08:24:37




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 Re: 12 or 6 volt coil in reply to Joe House, 08-21-2005 07:38:06  
Joe..... ...good guess but WRONG. Yer squarecan 4-nipple frontmount ignition coil top terminal volts depends upon wheather the points are "open" or "closed" and the type of meter you use to read it with. An "old-fashioned" analog voltmeter will kinda gittcha close, it'll average the volt pulses caused by the points opening or closing iff'n yer engine is running. A modern "digital" meter will be all over the place for a reading because of the way it detects the volts with a "peak-sample & hold" circuit. This is all technical stuff and electronic theory.

Heres the specs for yer OEM 6-volt squarecan ignition coil, engine NOT running. Points open = battery volts. Points closed = 3.2-volts (2.5-3.5 range is ok, but more than or less than yer gonnna haff sparkie problems) Doesn't matter wheather yer electrical system is 6-volt or 12-volt, OEM 6-volt coil top terminal about 3-volts, points closed. This is caused by the "infamous ballast resistor" and the 12-to-6-volt converting resistor and is the direct result of "Kirchoffs Law".

Heres the specs for the "modern" 12v squarecan ignition coil, engine NOT running. Points open = battery volts. Points closed = battery volts. Anything less than battery volts means you've gotta resistor somewheres in the circuit. Start to worry iff'n you read less than about 11-volts.

I can't tell you which squarecan ignition coil yer 12v conversion is using. You'll haffta be the finder-outter..... ....Dell

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Bob

08-21-2005 08:10:52




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 Re: 12 or 6 volt coil in reply to Joe House, 08-21-2005 07:38:06  
Well, checking the running voltage at the coil will certainly tell you if there are any resistors in the ignition feed from the switch, but it won't really tell you what coil someone has stuck on there, for certain.

Is the unit operating correctly, or are you having problems?



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Joe House

08-21-2005 08:23:51




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 Re: 12 or 6 volt coil in reply to Bob, 08-21-2005 08:10:52  
Yes, I posted below about how it wants to stop after 30-40 minutes and then won't restart until it cools down.



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Bob

08-21-2005 08:40:43




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 Re: 12 or 6 volt coil in reply to Joe House, 08-21-2005 08:23:51  
Assuming you have tried jumpering around the ignition switch to eliminate that as a source of the problem, I would first replace the condensor (because it's CHEAP, compared to the coil), and if that doesn't fix it, get a 12-Volt coil, BE SURE all other resistors are out of the circuit, and install "Dell's trick current limiting resistor" ahead of the new 12-Volt coil.



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