9n coil problems?

buckcreekfarm · Sep 15, 2009

I've been having trouble with my 9n in the past year or so. It cuts out when it is hot and a buddy told me it may be the coil. The tractor was converted to 12v about 10 years ago, and they stuck a resistor prior to the existing 6v coil. Am I correct that a 12v would be the one to get and just remove the resistor? Can a condenser behave the same, and should I assume that I need to switch it to 12v if I change the coil over to 12v? Nobody around here can test a coil, and I assume that it would test OK unless it was hot, and the problem is very infrequent, usually when I'm furthest away from home as luck has it. Thanks in advance for your advice!

John T · Sep 15, 2009

Yes, if you use a full true (some call internally ballasted) 12 volt coil NO BALLAST IS USED.......

NO the condensor can be the same regardless if 6 or 12 volt coil, their voltage withstand (insulation) rating is wayyyyyyyyyyyyy higher then 6 or 12 volts anyway. Their rtaing has more to do with the inductance value of the coil.

YES a condenor can also cause problems once its warm and for no more then they cost Id try it BEFORE a more expensive coil.

If the problem only occurs when she gets hot Id sucpect a coil or condensor but if that still dont fix the problem we have to go abck to the drawing boaord with more info.

A faulty ign switch can get more resistive when hot maybe by pass jump around it n see what happens

John T

buckcreekfarm · Sep 15, 2009

Thanks John,
My NAPA has the 12v in stock for $20 and the
6v is $75 and has to be ordered. Go figure...
The Condenser is $8 in stock.

Bob · Sep 15, 2009

buck,

Listen up and save your new coil from destruction!

JohnT is VERY knowledgeable about tractor ignition systems giving you GOOD generic advice that applies to 'most every 6 Volt - 12 Volt conversion EXCEPT the Ford "N"-series with the square-can plastic coil. He must not be familiar with the peculiarities of these ignition systems.

With the Ford "N" ignition system EVEN WITH a new 12 Volt square-can coil you will still need to keep the factory ballast resistor in the circuit ahead of the coil 'cause the "12 Volt coils" sold for this application ARE NOT true 12 Volt coils.

If you want to verify my advice, surf over to the "N"-specific Forum and ask the GURUS over there.
Ask

John T · Sep 15, 2009

Bob,

Thanks for the help Bob,,,,,,,, I ought to know better then to get into them dern Fords lol they have their particularities ESPECIALLY the ones with Class B charging systems......

I usualy warn people coils labeled "12 volts for use with (or requires) external ballast resistors" are in reality 6 volt coils and need the ballast as they say otherwise they run way too hot. What I call a full true 12 volt coil may be labeled "12 volt" or "12 volt NOT for use with external ballast"

Buck, best follow Bob and the fellers over on the Ford Forum MY BAD grrrrrrrr

John T (Never too old to learn) Thanks again Bob

old · Sep 15, 2009

Bob is 110% correct and you need to do as he says out you will be buying another coil sooner or later

Anonymous-0 · Sep 15, 2009

Trouble is the N family with the front mount distributor uses a special coil that only fits it. Ford never made a 12 volt coil. That limits the selection. If there is a "12 volt" coil its either the stock 6 volt coil with a resistor added internally or required externally or something invented and created just to fit the modified N tractor. The last year of 8Ns used a standard coil, but all before that used a special. And I question that $20 NAPA N coil? seems too cheap compared to the original that still should have wider application.

I had an 8N and after I put new brushes and bushings in the starter and made sure of good battery cables and connections it started fine in any Iowa weather. I did have to replace all the wiring and that made the generator work too.

Condensers can be heat sensitive, but in my experience, they don't tend to recover when cooled, but some report they do.

Gerald J.

buckcreekfarm · Sep 15, 2009

Thanks guys, Here is another facet to the story:
I went to the New Holland dealer and was in the process of purchasing one when I noticed that the CNH box had "made in China" on it, and I got mad since I can buy a Chinese one online for 1/3 of the price. I'd gladly pay double or triple in the name of USA, but none were available from the dealer. My assumption is that the $20 one is imported, and I'll try to buy domestic if I can find one. Maybe you folks can suggest a source for now and in the future.

buckcreekfarm · Sep 16, 2009

Hey Bob -and gang,
I went to NAPA and the $20 coil was a mistake, it was $73. Anyhow, which should I get, the 12v or the 6v replacement? Wouldn't the 6v be the easiest since it is already resistored down? Perhaps It died (after 8 years) of light use because of the new 12v system and It won't last long. I sure appreciate the advice, the old tractor is still
used very often and is quite functional. I've had it maybe 20 years or so.

9n coil problems?

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