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post #1 of 8 Old 07-10-2019, 12:10 AM Thread Starter
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no spark. Bad coil or condenser how do you test them?

I get 12 volts at the coil at the + and - also to the new regulator at the 3 lugs. I get a ohms reading from the points - wire to the - at the coil. I get a 5.4 ohms reading with the wires removed at the coil. (I get 0 volts across the coil with the key on, don't think this counts as anything). The points are gap to 20, and I see a spark there when I turn the key. The coil gets so hot now I can't touch it. K321 JD 314

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #2 of 8 Old 07-10-2019, 12:43 AM
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Re: no spark. Bad coil or condenser how do you test them?

Mike, Sounds like you've got an incorrect coil or bad coil. Coils basically come in 2 configurations: with an internal resistor, or without an internal resistor.

It sounds like your does not have an internal resistor and the 12 volts is overheating the coil. Another possibility is that the coil is shorted internally, which will also cause it to get hot.

A coil may get warm to the touch, but it should never be too hot to touch. Bob
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post #3 of 8 Old 07-10-2019, 06:36 AM Thread Starter
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Re: no spark. Bad coil or condenser how do you test them?

Thanks for the reply! When I did a (bench test) on the coil from either side post to the middle of the coil I get no reading. I just found this link How to test your coil, I performed test four seen on this web site https://www.wikihow.com/Test-an-Ignition-Coil

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #4 of 8 Old 07-10-2019, 06:48 AM
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Re: no spark. Bad coil or condenser how do you test them?

Wow! It's been a looong time since I've messed with a coil! If I remember correctly, there's no contact on the bottom of the center terminal...the wire contacts the sides of the hole. Make sure your meter is set to ohms and that the meter lead is touching the side of the center hole.

I've still got concerns about the coil getting soo hot! This should not happen! Bob
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post #5 of 8 Old 07-10-2019, 09:13 AM
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Re: no spark. Bad coil or condenser how do you test them?

You can get all the service info you need from the Kohler Bible

BTW the points are the usual culprit


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post #6 of 8 Old 07-10-2019, 11:44 AM Thread Starter
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Re: no spark. Bad coil or condenser how do you test them?

Quote:
Originally Posted by rwmeyer View Post
Mike, Sounds like you've got an incorrect coil or bad coil. Coils basically come in 2 configurations: with an internal resistor, or without an internal resistor.

It sounds like your does not have an internal resistor and the 12 volts is overheating the coil. Another possibility is that the coil is shorted internally, which will also cause it to get hot.

A coil may get warm to the touch, but it should never be too hot to touch. Bob
Thanks. Shoulds like it over heated. Kohler part number is 41-51921S. I was told it comes without a internal resistor. I got mine at O'reillys in 2013 with a lifetime warranty.

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #7 of 8 Old 07-10-2019, 12:20 PM
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Re: no spark. Bad coil or condenser how do you test them?

Mike, I've got a different part number from a Kohler parts manual, dated '93: Kohler 231281. Searching online, I've found several manufacturers that replace that coil part number. Waht I can't locate is if it has an internal resistor. Everything that I've found in several different forums state you NEED an internal resistor. The older cars, like before 1958-1960, had a ballast resistor mounted (usually) on the firewall. Later vehicles had resistive wiring from the ignition switch to the coil.

Now, all that said, if your tractor ran with a coil without an internal resistor, and your coil has a lifetime warranty, go back to O'Reilly and get a replacement! This will be the fastest way to get you up & running.

I'm going to keep looking to see what I can find, although I'm 99.9% sure you need an internal resistor. Good Luck at O'Reilly, Bob
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post #8 of 8 Old 07-10-2019, 02:58 PM Thread Starter
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Re: no spark. Bad coil or condenser how do you test them?

This is how I found the kohler part number. kohlerenginesparts.co It won't let me post the link. ??? I found these number too.
Kohler 231281S
Kohler 231281
Kohler 4151921A
Ariens 20355500
Gravely 022152
John Deere AM38411

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck

Last edited by mlizotte; 07-10-2019 at 03:18 PM.
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