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Ford 9N, 2N & 8N Discussion Forum
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Coil Problems

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Alan Kilberg

06-03-2004 13:54:27




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I have a strange problem in the electrical system on my 8N. The coil seems to be going bad after 20-30 hours of run time. Tractor will run fine, and then suddenly die. When I check, I have no spark. I have 6 volts to the coil and on both sides of the coil, but no high voltage coming out the top to the distributor. Last time this happened I put in a new coil and it solved the problem, now I have it again. I have the + side of the coil hooked up to the distributor side and the - side to the reugulator side. Is this correct? Any thoughts on what else might be causing this? (When I first put the new coil in, the tractor ran fine, and as I said, did so for 20-30 hrs. Any help would be appreciated.

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Dell (WA)

06-03-2004 18:38:34




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 Re: Coil Problems in reply to Alan Kilberg, 06-03-2004 13:54:27  
Alan..... ...as a general rule the 6 volt 5-nipple sidemount roundcan ignition coil is fairly bulletproof. And yes, yer replacement coil (+) should be connected to distributor terminal, iff'n yer still 6 volt POSITIVE GROUND. Rule is (+) to (+).

Usually, most ignition system failures occure in the first hour of operation. Common failures include "bad coil"; broken points; slipped points gap; shorted/leaky condenser; sparkie wires slippin' back outta nipples and loosing contact; cracked 5-nipple cap; broken rotor;

Your report of 6 volts outta BOTH sides of yer coil, tells me yer coil primary is continious (good) and yer points are open. And iff'n ya was to stick yer voltmeter probe down the coil center nipple, you should read 6 volts down there too. (points open) and I'd consider the coil secondary good too.

I'm assuming that yer tractor ain't runnin' at this time, so I'd pull the cap and check that you have 6 volts to the moving side of your points. (points open) And obviously, points gap 0.025" while yer inthere. The #8x3/16" points screw threads wear out (visually look good) but won't keep the points gap tight. Check that. New screw p/n 355047-S7 is also used in many Ford automobile distributors..... ....Dell, the self-appointed sparkie-meister

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TIMW(PA)

06-03-2004 14:18:04




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 Re: Coil Problems in reply to Alan Kilberg, 06-03-2004 13:54:27  
Dell will answer this soon but, I try to head off some problems for ya....First what tractor is this on? Front? or side mount? Is it still stock 6 volt pos. ground system? or has it been converted to 12?
If it is a 6 volt front mount square distributor I think 6 volt to the coil is too much and you probably need a resistor....But I'm not sure...get the particulars to us that way dell or one of the other guys can correctly diagnose whats goin on...Have a good day...Tim

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Al Kilberg

06-03-2004 15:58:35




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 Re: Re: Coil Problems in reply to TIMW(PA), 06-03-2004 14:18:04  
It is a stock 8N, after s/n 263844, 6 volt system. Never been converted. Re. the 6 volts, I didn't look that close, I was just checking for voltage. Could have been less, and I can check that as well. Hope that that info helps.



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