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kohler K321 charging sys?

D

Don B.

Member
I have a JD 214 with a 321 AQS Kohler engine. (original as far as I know) Been a great running machine. That was until my son left the key on for a couple days and I had to jump it with my truck. Dead as a doornail;; since, it wont run worth a crap unless I disconnect the 3 wire plug on the voltage regulator. It spits farts cuts out etc when connected; runs fine with it unhooked; I fear the stator may have shorted out from having to charge "full tilt" to recharge the battery; yeah I know about charging the battery with a charger rather than the stator but I needed the machine then and didn't have time to let it charge up 1st. It ran great for probably 15 min after the jump start, before acting bad. I disconnected that plug, finished my job, and then plugged the charger in. But even woth a now fully charged battery I still cannot plug that reg in and have it run right.

Being a battery ignition I didnt think the stator had anything to do with how the engine runs; had I had a magneto ignition that idea would definitely make a whole lot more sense to me.
 
Just a wild guess. You may have burned that up and have a BAD short. If so, that short could possible draw the battery so much there is not enough voltage left for the ignition. If you have a volt meter, check your voltage with the plug connected to see if you have low voltage.

My first thought was the ignition left on burned the points so much that that was causing the bad running. But no, in that case it wouldn't run good with the plug disconnected.
 
It's probably the regulator thats bad,but 1st check ouput from stator,connect a voltmeter to the outside pins on 3 prong conn that goes on reg,with eng running at full throttle,if alt stator 10A,should read min 20v AC,if 15A stator should read min 26v AC,if you have above voltages reg bad,if you can't get min voltages,stator bad.Alt output does affect ign system,as coil gets voltage from battery,if battery not being charged,voltage drops,due to fact kohler coil uses an internal dropping resistor to reduce voltage to same when battery charging to prevent overheating/burnout,as battery voltage drops it lowers internal primary voltage in coil,finally voltage gets to low to produce spark.
 
Here's where to check for the ac voltage to your regulator should be in the 20 to 30 volt range at 1/2 throttle or better. Hal
5y9847s.jpg
 
You did not happen to connect the booster cables backward when you first jumped it did you? If you did this will destroy the regulator. If this is what happened and it happens to use ALL. Buy a new regulator install it and VERY IMPORTANT, INSTALL A 30 AMP IN-LINE FUSE IN THE WIRE TO THE CENTER TERMINAL OF THE REGULATOR. If you install the fuse and this accident happens again, all you will have to replace is the fuse.

Kent
 
been busy working on everyone else's crap lately; Thank you for your help/replies; I have the tractor dismantled for other reasons and it has been for about 2 weeks; HOPEFULLY I can get caught up this weekend (holiday but wife still works) so i can again work on my own!!! Sorry no replies/feedback since you guys answered. And NO I did NOT hook up the jumpers backwards; I made that mistake once as a teen and since am extra careful of that.
 
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