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not charging

#1

J

johnorlandi

I have a Agco Allis 918H (symplicity) that I rebuilt the engine 2 years ago and replaced the stator, I also purchased a cheap rectifier on line and not charging, now I purchased a Kohler rectifier and it is still not charging. I have checked the stator and it is putting out 26 AC volts each leg. Where do I go from here, what next to check?

Thanks guys


#2

B

bertsmobile1

Did you check the DC wire from the rectifier to ground ?
Did you check that the rectifier is grounded to the engine or frame ?
Kohler mount the rectifier by the plastic blower housing but the body of the rectifier needs to be ground or the rectifier is open circuit on the DC side and can not recharge the battery.
THe grounds are usually a flat strap which tend to break at the bends .
Whenever one comes in to the workshop I make a pair of ground wires and ground the rectifier each side to the engine.


#3

R

Rivets

Kohler charging systems should normally have 28+ VAC on each circult. 26 VAC is too low, indicating bad stator.


#4

Hammermechanicman

Hammermechanicman

Have you checked the flywheel magnets?


#5

tom3

tom3

That was the problem with my mower. Still had good voltage showing but no current. Ole Tarryl fixes all on Youtube has a good video on this.


#6

J

johnorlandi

Hammermechanicman said:
Have you checked the flywheel magnets?
Click to expand...
no not really when I had the engine apart they looked good


#7

J

johnorlandi

Rivets said:
Kohler charging systems should normally have 28+ VAC on each circult. 26 VAC is too low, indicating bad stator.
Click to expand...
I will check the AC voltage again for it is a new Kohler stator thank you


#8

J

johnorlandi

bertsmobile1 said:
Did you check the DC wire from the rectifier to ground ?
Did you check that the rectifier is grounded to the engine or frame ?
Kohler mount the rectifier by the plastic blower housing but the body of the rectifier needs to be ground or the rectifier is open circuit on the DC side and can not recharge the battery.
THe grounds are usually a flat strap which tend to break at the bends .
Whenever one comes in to the workshop I make a pair of ground wires and ground the rectifier each side to the engine.
Click to expand...
yse I think I did this all but I will copy your list and go and do it again to be sure thank You


#9

B

bertsmobile1

Kohler have most of their service manuals on line for free download .
They have a good electrical testing section


#10

J

johnorlandi

bertsmobile1 said:
Did you check the DC wire from the rectifier to ground ?
Did you check that the rectifier is grounded to the engine or frame ?
Kohler mount the rectifier by the plastic blower housing but the body of the rectifier needs to be ground or the rectifier is open circuit on the DC side and can not recharge the battery.
THe grounds are usually a flat strap which tend to break at the bends .
Whenever one comes in to the workshop I make a pair of ground wires and ground the rectifier each side to the engine.
Click to expand...

bertsmobile 1 I had checked the voltage before and had voltage not what was required so I did like you said and checked again and not putting out. I had a problem with the flywheel once before so I ordered a new Kohler flywheel and a stator I already have the kohler rectifier.

Thanks for the help, this should work

John


#11

B

bertsmobile1

Very rare for a flywheel to go bad other than the magnets falling off or breaking away & joining together .
Kohler use regulator rectifiers , not plain rectifiers so they only allow power through when there is a need for it
So make triple sure that the resistance between the red wire on the rectifier and the battery is 0 with the ignition turned on .
The alternator will not generate if it can not see the battery needs charging .
A trick that works well when I suspect that there is a problem with the charging circuit is to connect a battery charger to the + wire on the rectifier plug ( plug disconnected from rectifier ) and the - on the battery .
Turn the charger on then check the voltage at the charger and at the battery .
They should be almost the same
do this with both the key turned on & off .
If I am still not convinced the charging circuit is good, I slip an old headlight globe between the battery & charger to put a load on the circuit.
Kohlers seem more prone to wires breaking at the crimps so they just touch
In this condition they will show continuity with a volt or ohm meter but will not carry a load .
Gets really frustrating when you keep seeing continuity but that moungrel battery just won't charge


#12

J

johnorlandi

bertsmobile1 said:
Very rare for a flywheel to go bad other than the magnets falling off or breaking away & joining together .
Kohler use regulator rectifiers , not plain rectifiers so they only allow power through when there is a need for it
So make triple sure that the resistance between the red wire on the rectifier and the battery is 0 with the ignition turned on .
The alternator will not generate if it can not see the battery needs charging .
A trick that works well when I suspect that there is a problem with the charging circuit is to connect a battery charger to the + wire on the rectifier plug ( plug disconnected from rectifier ) and the - on the battery .
Turn the charger on then check the voltage at the charger and at the battery .
They should be almost the same
do this with both the key turned on & off .
If I am still not convinced the charging circuit is good, I slip an old headlight globe between the battery & charger to put a load on the circuit.
Kohlers seem more prone to wires breaking at the crimps so they just touch
In this condition they will show continuity with a volt or ohm meter but will not carry a load .
Gets really frustrating when you keep seeing continuity but that moungrel battery just won't charge
Click to expand...

Why I am changing the flywheel is the original stator broke apart (after I rebuilt the engine) and damaged some of the magnets. I replaced the stator and I cleaned the magnets the best I could but I guess they still are not right so the easiest thing to do is replace all. I will take your advice once I replace all. If when I get the flywheel off I will let you know how good or bad the flywheel is

Thanks for all the info

John


#13

J

johnorlandi

johno778@cox.net said:
yse I think I did this all but I will copy your list and go and do it again to be sure thank You
Click to expand...
I finally changed the flywheel/stator/rectifier with all Kohler parts and it is charging great. Thank for the help, the flywheel magnets were all screwed up


#14

B

bertsmobile1

Well done
Kohler magnets tend to give more troubles than all the others added together
Never needed to change a Kohler stator unless something had got in there and munched everything up .


#15

J

johnorlandi

bertsmobile1 said:
Well done
Kohler magnets tend to give more troubles than all the others added together
Never needed to change a Kohler stator unless something had got in there and munched everything up .
Click to expand...
yes the stator got chewed up a little and I wasnot going to take the chance I bite the bullet and put everything new it work great now

thank again for your help


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