Craftsman 18.5hp

ShadowTN(6)June 2, 2014

I have a Craftsman 18.5hp mower model # 917.274641.

I have gone through 3 batteries this spring. The battery is fine for 2 mowings and then it will not start the next time I need to cut.

It appears that the battery is not charging since I have tried 3 new ones with the same results.

How can I test to see if the battery is getting charged?


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You have a 9 AMP charge system, so IF it's working, that should be adequate.
Probably the easiest quick test is-
With the engine at low speed, turn on the headlights.
When you speed up the engine, do they get a bit brighter?
With the volt meter across the battery, take a "static" reading. It should be 12+ VDC.
Start engine. At high speed, the DC Voltage should increase to 14ish.

If you look at the schematic in the Owners Manual, you'll see a test point to check the stator output. Min 28 VAC, with the Voltage Regulator disconnected @ high engine speed.
Assuming it's not charging, you can at least tell if the stator is good.

    Bookmark   June 2, 2014 at 10:07PM
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Thanks Bill ... I will see if I can follow the schematic to find the test point.


    Bookmark   June 3, 2014 at 10:37AM
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Bill I did the testing as you described. The AC output from the stator was close but the DC output from the regulator was only about half of the value.

I have replaced the regulator and will give it a try again.

    Bookmark   June 3, 2014 at 4:45PM
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