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Ford 9N, 2N & 8N Discussion Forum

2N wiring

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Phillip

11-12-2003 14:03:16

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I am working on a 1944 2N for a neighbor lady and need some help. Front mount dist., 12v battery, unknown voltage round coil 'for use w/external resistor' on side, and two resistors. One resistor is a ceramic type square shape approx. 2 inches long, and the other is a round hollow core ceramic glass type resistor approx. 3 inches long. The square one is between the battery and the coil (+) and the round one is between the coil (-) and the points. Is this a correct way to wire the system? I do not know who converted the tractor. By the way, no spark. Parts are ordered, coil, points, condenser, rotor button.

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Phillip

11-13-2003 03:24:26

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Re: 2N wiring in reply to Phillip, 11-12-2003 14:03:16

Thanks guy's. Each is a great help.

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Dell (WA)

11-12-2003 20:27:03

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Re: 2N wiring in reply to Phillip, 11-12-2003 14:03:16

Phillip..... ....ah yes, the stealth ignition coil conversion (grin).

Heres the deal, the original converter probably "hogged out" the gutts of the OEM squarecan ignition coil and used a 6 volt roundcan ignition coil with 1-resistor too many.

Some tractor dealers are selling a 12 volt coil labled (requires external resistor) and guess what? its really a 6 volt coil that needs a 12 to 6 volt converting resistor. So basically your friends tractor is trying to run with 3 volts on a 6 volt coil and ain't gonnna run worth snott.

Me? before I replaced any parts, I'd remove the resistor between the coil (-) and the points. Bettcha it'll run. You may need to replace parts later..... ...Dell

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Bob

11-12-2003 18:56:04

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Re: 2N wiring in reply to Phillip, 11-12-2003 14:03:16

It is never good practice to have a resistor between the points/condensor and the coil primary. Resistors should be between the power lead from the switch and the coil primary terminal. If it is necessary to use 2 resistors to adequately reduce the battery voltage, they can be hooked up in series ahead of the coil. A resistor between the points and the coil would probably cause a weaker spark, and possibly cause the points to burn faster than a resistor placed in the correct part of the circuit. This being said, I am sure there are instances where a system with a resistor between the points and the coil primary have worked OK, but why risk a weaker spark by hooking an ignition system up improperly?

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souNdguy

11-13-2003 06:05:23

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Re: Re: 2N wiring in reply to Bob, 11-12-2003 18:56:04

Yeah Bob.. like Deuy said.. series resistance placement doesn't make difference.. voltage is being dropped across each resistor.. and current limited.. it's all ahead of the points ( connection to ground ) anyway ( though you could have them anywhere...

Soundguy

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Bob

11-13-2003 06:26:56

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Re: Re: Re: 2N wiring in reply to souNdguy, 11-13-2003 06:05:23

It's not a simple matter of series resistance. You do not want a resistor between the coil and the condensor.

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souNdguy

11-13-2003 07:23:54

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Re: Re: Re: Re: 2N wiring in reply to Bob, 11-13-2003 06:26:56

Total voltage dropped and current are constant in that circuit no matter where the resistors are located, as long as series. That said, with the inductance of the ignition coil a constant, the voltage dropped accross the field primary, and the current through the field primary are the same.. thus same results with the secondary induced voltage...

Considering the cap can be missing ( and you then burn points ) and you can still have spark.. the coil isn't relying on that leg of the circuit for a reference to ground... so there would be no high voltage applied to any resistor between the coil and the points..... etc

So.. where's the difference. If I'm wrong.. point it out. I don't claim any great knowledge of ignition systems themselves.. just electronics. I havn't seen a specific schematic of our ignition systems, component by component, but if you have one.. I would welcome seeing it.

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Dell (WA)

11-13-2003 12:55:50

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Re: Re: Re: Re: Re: 2N wiring in reply to souNdguy, 11-13-2003 07:23:54

Sounder..... ...you don't want any resistance between the coil primary and the points because you'll have a "R-C TIME CONSTANT" that will slowdown the collapse of the ignition coil magnetic field when the points open. And if'n you don't get a fast collapse, you don't get a HOT sparkie.

Howsomevers, with the 1-terminal squarecan frontmount ignition coil, you can't get 'nuttin' between the coil and the points..... ...Dell

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Bob

11-13-2003 23:20:43

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Re: Re: Re: Re: Re: Re: 2N wiring in reply to Dell (WA), 11-13-2003 12:55:50

Thanks Dell!

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souNdguy

11-13-2003 13:01:42

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Re: Re: Re: Re: Re: Re: 2N wiring in reply to Dell (WA), 11-13-2003 12:55:50

Cool.. ok, so we are talking about a timing factor for field colapse and spark discharge... Thats what I needed to know... the tank circuit deffinately would make a difference.

Soundguy

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duey

11-12-2003 15:00:22

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Re: 2N wiring in reply to Phillip, 11-12-2003 14:03:16

Hi Phillip, electrically speaking, it doesn't make any difference where in series the resistors get placed. doesn't matter, they do the job.

It does make a difference as to what the measured voltage is at different places.

What is important is that the coil, (IF it is a 6 volt coil) be run at approximately 3 volts. To check, be sure the points are CLOSED and read the voltage difference between the two coil terminals. Don't read to ground in your case. Good Luck duey

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