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Ford 9N, 2N & 8N Discussion Forum
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Re: Is Tip 38 no joke, or do I have bigger problems?

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wingmanchris

06-16-2014 09:45:56
70.195.139.147



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I cannot find any info on bench testing the coils in any manual or anywhere online. I did happen upon this post though:

http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=nboard&th=557601

I checked the coil according to what Soundguy recommended and both the primary and secondary are reading way outside of what he suggested. I tested the condenser in the same manner as he suggested and it reads ok.
The last coil is definately bad. I tried multiple times resetting and cleaning the points and finally replaced them again and still no spark. I tried to start it one last time before changing the coil and had no spark. Replaced the coil and it fired right up. Drove it around the property for a few days and then ran it out of gas.

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Bruce (VA)

06-16-2014 10:12:21
24.125.183.11



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 Re: Is Tip 38 no joke, or do I have bigger problems? in reply to wingmanchris, 06-16-2014 09:45:56  
" I checked the coil again and it is shot."

So this is where you are?

Tell us exactly what you are seeing on the ohm meter that leads to that conclusion. And here's why.......

There are a few ways to see if a coil is bad, but itís not possible to determine if a coil is good w/o some expensive testing equipment. If you detect a dead short or high resistance in the coil w/ an ohm meter, itís bad. If itís cracked, itís bad. If a sidemount coil w/ battery voltage to the primary will not jump a ľĒ gap from the secondary wire to the block, itís bad. But, here is the hard part: even if you do not detect a short, even if it will produce a spark, even if itís not cracked, that doesnít mean the coil will work when itís hot & under a load. So, itís a process of elimination. If the tractor starts & runs fine for 30 minutes or an hour then cuts off & refuses to re-start, and you checked for spark at the plugs & it had no spark at all, AND you have the correct voltage at the coil thatís a good sign that you have a bad coil. Let it cool off, restart it & if you have a good spark, odds are itís a bad coil. But, even then, you might end up w/ a spare coil on the shelf!

Bottom line.......coils do go bad, but I'll venture a guess that 75% of new N coils sold today are sold to folks who do not understand how to diagnose a poor spark problem or how a coil works. So, for those who donít know any better, in a no spark situation the first suspect is usually the coilÖÖand, more often than not, it isnít the problem.

Or as one regular around here humorously suggested: "Well, it is like this...I don't know or really understand what that black thing does & I am suspicious of the unknown, so I think the problem is the black thing."

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