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Charging problem on 618

#1

M

maggy

Had a blown 30 amp regulator fuse how to find and test regulator
any help please
dave


#2

M

mechanic mark



#3

R

Rivets

If we knew which engine model you have, we could help you a whole lot better. Post model and serial numbers off the engine tag.


#4

M

maggy

Model 618 serial number 5415475 2004 grasshopper


#5

Tiger Small Engine

Tiger Small Engine

maggy said:
Model 618 serial number 5415475 2004 grasshopper
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I am working on replacing stator and regulator/rectifier on an approximately 20 year old Grasshopper 618. Engine identification information is gone, and best I can tell it is a Kohler Command CH18. It is a fairly involved job to replace these parts. Stator was charging at 19.8 volts AC when tested. Should be about 28 volts AC. When you are in there with engine shroud off, be sure to check snd clean cooling fins. See very few Grasshopper zero turns and I am glad. Not a fan at all.


#6

M

maggy

Tiger Small Engine said:
I am working on replacing stator and regulator/rectifier on an approximately 20 year old Grasshopper 618. Engine identification information is gone, and best I can tell it is a Kohler Command CH18. It is a fairly involved job to replace these parts. Stator was charging at 19.8 volts AC when tested. Should be about 28 volts AC. When you are in there with engine shroud off, be sure to check snd clean cooling fins. See very few Grasshopper zero turns and I am glad. Not a fan at all.
Click to expand...
Thanks that does help i did find the regulator will test it


#7

Tiger Small Engine

Tiger Small Engine

maggy said:
Thanks that does help i did find the regulator will test it
Click to expand...
I replaced the stator and regulator/rectifier yesterday, and still getting no charging, and 50 volts AC from stator. Never had this problem after removing and replacing stator. Any suggestions other than the flywheel may need to be replaced?


#8

StarTech

StarTech

Flywheel won't need replacing as you are generating the require output voltage.

You do have the regulator grounded don't you? It would not be the first time I have seen other techs to forget to ground the regulator case.

Also is the battery voltage at the B+ when not running? These regulators do require standing battery voltage to present in order to operate.


#9

Tiger Small Engine

Tiger Small Engine

StarTech said:
Flywheel won't need replacing as you are generating the require output voltage.

You do have the regulator grounded don't you? It would not be the first time I have seen other techs to forget to ground the regulator case.

Also is the battery voltage at the B+ when not running? These regulators do require standing battery voltage to present in order to operate.
Click to expand...
Star Tech-
I have regulator/rectifier grounded. Also hooked up temporary additional ground wire and still not charging. There is power from battery to middle wire at regulator when engine is not running. I am at a loss and have several hours labor in this repair and don’t know what it could be. Can anyone offer any additional help. Thanks in advance.


#10

StarTech

StarTech

Do you have least the battery voltage on the B+ when the engine is running?

Yes you said you with the power off but it be kind of rare ignition switch problem. Just depends on the wiring of the system.


#11

B

bertsmobile1

Tiger Small Engine said:
I replaced the stator and regulator/rectifier yesterday, and still getting no charging, and 50 volts AC from stator. Never had this problem after removing and replacing stator. Any suggestions other than the flywheel may need to be replaced?
Click to expand...
Are you getting 14+ V at the regulator output terminal
If not then the regulator is faulty
If you get battery voltage on the output pin this shown you ave a circuit between the rectifier & the battery
Try a KNOWN GOOD rectifier off something else


#12

M

maggy

maggy said:
Had a blown 30 amp regulator fuse how to find and test regulator
any help please
dave
Click to expand...
Pulled regulator plug off started engine ran fast rpm ac voltage was 20 volts still just 12 volts at battery have not tested regulator sounds like the stator is the problem if just getting 20 volts ac
any ideas
thanks dave


#13

B

bertsmobile1

Ac readings will be double the DC so if the rectifier was 100% efficient all you will get is 10V DC and that aint enough
Some times if the mounting points for the stator are corroded or dirty a clean up will sort that out
Another problem is the magnets can come loose then join together and fewer magnets = lower voltage
I have even had one engine with a mile of magnetic dust between the magnets
It was packed in so tight I thought they were separator plates .
Cleaned the flywheel up an bob's yer uncle


#14

Tiger Small Engine

Tiger Small Engine

bertsmobile1 said:
Ac readings will be double the DC so if the rectifier was 100% efficient all you will get is 10V DC and that aint enough
Some times if the mounting points for the stator are corroded or dirty a clean up will sort that out
Another problem is the magnets can come loose then join together and fewer magnets = lower voltage
I have even had one engine with a mile of magnetic dust between the magnets
It was packed in so tight I thought they were separator plates .
Cleaned the flywheel up an bob's yer uncle
Click to expand...
I was unable to get Grasshopper to charge battery (see previous posts). Unit has gone to another shop and he will let me know what issues ultimately was. I will post here with problem and solution. Thanks again to the support I got here.


#15

Tiger Small Engine

Tiger Small Engine

Tiger Small Engine said:
I was unable to get Grasshopper to charge battery (see previous posts). Unit has gone to another shop and he will let me know what issues ultimately was. I will post here with problem and solution. Thanks again to the support I got here.
Click to expand...
Update: It turns out the brand new regulator/rectifier I installed along with new stator, was defective. Like a big dummy and being frustrated with the repair, I didn’t test the new regulator with my multimeter. Other shop caught it right away. Wanted to let you all know and thank you again for your help. Second time in 4 years I have received a new part that was defective. So keep an eye on new defective parts.


#16

StarTech

StarTech

This is why I tell my customers that new doesn't always mean good. I perfer to test with known good working items and then install new to see if they are good.


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