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!2 Volt Coil Debacle

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10-29-2001 16:19:42

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I recently bought a 2N that has a 12v alternator and a 12 volt coil mounted on the side of the block. The original coil is still in place with a hole in the front. Two wires run through this hole one from the center of the coil and I believe one from the small terminal on the coil. The battery will not hold a charge and the engine will not start, when jumped, or with a shot of ether. I question if this arrangement ever worked. The previous owner was a non-mechanical lawyer that said he always pulled it to get started. So, where do I start? What voltage should I have at the wire that goes into the coil? points open / points closed.

Any help appreciated. The wife wants to know if it was such a good why won't it start??



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Phil (AZ)

10-30-2001 14:28:49

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 Re: !2 Volt Coil Debacle in reply to Zed-MD, 10-29-2001 16:19:42  
When I got my 9n it also had an external Coil that worked well, but it was mounted under the leaking gas tank. I replaced it with the correct Coil and have the old one as a spare.( have 4+ years on OEM points & Coil )

The dist itself is not modified and should be serviced per manual. The Small wire, from the external coil, connects to/under the Concave Screw in the Dist.

The Hi-Voltage wire (large), from the external Coil, connects to the Old “Coil" Contact spring (soldered) this contacts the Dist Cap when the coil is installed.

The other Small wire, on the External Coil, will be connected to the electrical Terminal Block Upper Right (ballast in line) or upper Left (ballast bypassed).

Testing an external Coil with meter: Connect the meter across the external Coil small wire terminals ( one probe on +/ bat and other probe on -/ dist) When the points are “Closed” the voltage reading will be ~ 12 V (ballast bypassed) or ~ 8 V (ballast in line). When the points are OPEN the voltage will be 0 (zero) . (Bump the starter to open and close Points) The Open condition is “Very” important (zero) and valid. The Points Closed measurement can be ~ 12 V even with an “open” bad Coil ... so you need to make sure current is flowing in the coil. This can be done by simply looking at the ammeter on the dash (> 2a OK), or adding(just for testing) a resister (ballast) in line and measuring across the Ballast ( 2-3 v OK) , or a test light connected to the -/dist coil connector (with points open) the lamp should light.

Hope this helps,

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Just me my 8N

10-30-2001 03:04:33

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 Re: !2 Volt Coil Debacle in reply to Zed-MD, 10-29-2001 16:19:42  
Well Sam, it looks like Dave, Dell and Claus took care of your electrical questions, but did little for your other problem.

My wife told me that it was either her or my 8N and I found a great moving company. God, I love that tractor.

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ah yeah . . . Dell (WA)

10-29-2001 18:34:54

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 Re: !2 Volt Coil Debacle in reply to Zed-MD, 10-29-2001 16:19:42  
Zed.........there are many ways to convert your frontmount 2N to 12 volts, some of 'em even work.

Sounds like the converter used the ol'hog'em out technique. This scheme gutted the frontmount ignition coil and basically threaded an externally mounted 12 volt coil sparkies thru the shell of the 2N's frontmount coil. And also snaked out the wire for the points.

This will work, but then when some unsuspecting, electrically challenged, new owner has problems, nobody can really help too much, because the new owner donna know from nuttin'. And then the pressure from the helpmate......gaugh!

I really don't think there is a direct relationship between discharged 12 volt battery and gutted ignition coil except twas done by the same knucklehead.

What would I do? I'd do some searching on 12 volt conversion on the internet and studdy how it was done. Once I had a basic understanding, I'd probably throw the present kluge innna trash and do a more conventional 12 volt conversion using the standard 6 volt frontmount ignition coil and the "infamous ballast resistor" mounted on the backside of the dash AND a 12 to 6 volt converting resistor. Connect the two aforementioned resistors in series (like flashlight batterys) from the ignition switch to the coil terminal. You should read about 3.5 volts (2.5 min, 4 max) with the points closed and battery volts with points open. Anyother volts gonna give ya sparkies problems.

Then ya gotta worry why the battery won't get charged. This could be anything from bad battery, bad alternator, bad wiring, DUMB conversion. I'd get both the alternator and the battery checked at the autoparts place and then figger out how to make certain the wiring was done per the scheme that I found searching the internet.

I love 12 volt conversions done correctly, and curse those that think they're smarter than the book. If'n you still don't know or understand whats going on after you've done some research, please ask for more assistance.........Dell

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John Diercks

08-12-2006 17:03:58

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 Re: Re: !2 Volt Coil Debacle in reply to ah yeah . . . Dell (WA), 10-29-2001 18:34:54  
I would like advice on "repairing" a 12 v conversion. Specifically, what would be wrong with replacing the 6v regulator with a 12 v on an 8N front mount? What IS that box behind the dash?? Isn't the voltage reg on top of the distributer? I have seen a 12v offered on the internet as a direct replacement. Is a resistor needed if the regulator is replaced and if the coil is 12v? Thanks for any help.

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Hey Claus

10-29-2001 17:57:12

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 Re: Re: !2 Volt Coil Debacle in reply to Dave Smith, 10-29-2001 17:41:18  
Hey Claus will you please help this guy out

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10-30-2001 05:15:16

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 Re: Re: Re: !2 Volt Coil Debacle in reply to Hey Claus, 10-29-2001 17:57:12  
It is difficult to help people who have Ethiopian Engineering on their tractor because one has to guess as to what they have. I have heard of people taking the front mount coil and doing what he has. My recommendation is that he gets the correct front mount coil and restores his tractor to an original configuration. (exception maybe a 12 volt coil and the defacto standard for 12volt conversion. Then we can help him...
Happy Motoring

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Dave Smith, It may sound wierd

10-29-2001 18:10:29

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 Re: Re: Re: !2 Volt Coil Debacle in reply to Hey Claus, 10-29-2001 17:57:12  
But it does work.As a matter of fact Macs Antique auto parts sells a kit to do it on the flathead V8s. I have done it to my doodle bug. Those original style coils are $80.00 each. Dick Flynn in his book Technical tips tells how to do it with a old coil. If you don't know who Dick Flynn is he is one of the guruos on flathead V8s.
Dave <*)))><

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