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J

jack casey

Well-known member
IHCC Supporter
Joined
Jun 15, 2022
Messages
269
Location
pearl river ny
I have a Cub Cadet 102 with what looks like an oem coil. The K241 engine cranks a bit slow, 2-3 seconds, but always starts. Strong battery. Coil is attached to engine as you can see in pix and with multimeter I tested resistance, numbers flying all over. Was hoping against hope for 3.5 ohms or so. Again, the tractor starts and runs even with the flying numbers. What to do? Think the Bosch helps with cranking, what are other benefits?
Searched the forum w/o luck.
Thanks, Jack
 

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It has a starter generator so slow cranking is built in. The starter wires and battery needs to be up to the task rather than changing the ignition coil.
 
bwstevens said:
It has a starter generator so slow cranking is built in. The starter wires and battery needs to be up to the task rather than changing the ignition coil.
Click to expand...
Thanks guys for responding. But what explains the poor test results, I tested post to post and get repeated crazy resistance numbers, never seeing 1.5 or even 3.4. After 10 seconds of craziness the meter settles at 1.000
Help, Jack
 
Be sure you have a good multimeter. The cheap Chinese-made devices are highly inaccurate. You should see 3.4 - 4.0 ohms on the primary with a steady and consistent reading.
 
OK, Dave, are we talking analog or digital multimeter. Are we trying to take a reading with that sucker running? Merry Christmas from Northern Maine! :)
 
You will not get "correct" resistance readings unless you disconnect the the wires from the terminals, because you are "charging" the condenser. After it is charged the resistance will stabilized but the reading will include the coil and the condenser and not the 3-4 ohms that you are expecting.
 
jstich said:
You will not get "correct" resistance readings unless you disconnect the the wires from the terminals, because you are "charging" the condenser. After it is charged the resistance will stabilized but the reading will include the coil and the condenser and not the 3-4 ohms that you are expecting.
Click to expand...
 
$100 to prove that a working coil is not bad? Not going to happen in this lifetime. Ho, Ho, Ho.
Just show me a big blue spark off of the big wire and no smoke off the little wires and I'm a happy camper. I have several of those $100 meters but the big blue spark test is much more accurate.
Otherwise....
Yellow Spark=Bad Condenser
Tiny or no Spark; "Borrow" an emery board from your wife and clean the points.
Ho, Ho, Ho, Merry Christmas.
 
jstich said:
You will not get "correct" resistance readings unless you disconnect the the wires from the terminals, because you are "charging" the condenser. After it is charged the resistance will stabilized but the reading will include the coil and the condenser and not the 3-4 ohms that you are expecting.
Click to expand...
I searched the 'net for proper way to test a coil, one site (forget which one) said ok if wires connected. Wrong! Multimeter is a Micronta 22-184, it be old but never fails. So, ignition off, two wires and spark plug cable removed - get 04.3 ohms, just the two wires removed - get another 04.3, expected that. At another time today, earlier, got 4.8 ohms. Too high?
Jac k
 
Slow cranking would be caused by a bad battery, corroded, dirty, or undersized battery cables, bad electrical connection on any of the battery or starter cables, bad bearings in starter/generator, worn brushes or commutator in starter/generator, bad armature in starter generator, or non-functioning compression release in the engine. The ignition system has absolutely nothing to do with how well the engine turns over.
 
I ran into a problem years ago with the switch, it would lose voltage to the coil when in the crank position but would have voltage when just in the on position . Just a thought.
 
mgonitzke said:
That resistance is within the range in the diagram fcurrier posted. Coil is fine. You seem to be searching for a problem where one does not exist.
Click to expand...
I saw Frank's post with diagram but in my readings (online) I was led to believe that 3.5-3.7 ohms was perfect. I got 4.3 and it made me look again at Frank's. All is good. Lotta support from youse guys and I am thankful.
Jack
 

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