Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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Lawn mower will not hold charge with new battery sometimes starts sometimes no l 120 john dear mower I change my alternator, but it was not turn the fly wheel. what I did wrong

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  • Samuel Charles Spriggs May 11, 2010

    Could you elaborate on this statement?

    "but it was not turn the fly wheel"

    Did you fully charge the battery before you ran the new alternator?


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Often mowers come with batteries which simply do not have the cranking amps to do the job. Have someone look at your mower and see if your attery has the sufficient cranking amps.

Posted on Aug 30, 2009

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Lawn mower will not hold charge with new battery sometimes starts sometimes no l 120 john dear mower

Check your battery water level if it's not a sealed battery. Some small batteries require you to fill them with both acid and water, some with water only when new.

If that is not a issue then you are most likely running on your battery alone. You need to check your charging system. Check your battery voltage when the unit has not run for at least an half an hour. Then check it when it's running. The voltage should be higher. It should be 12.5 to 14vac. Lower means your alternator is not working or a fuse is blown in your charging system. Higher means your voltage regulator went bad and the higher voltage will cook your battery in time. The voltage regulator is usually in the alternator and can not be changed without replacing the alternator. Check your parts diagram. If it lists a voltage regulator then you are in luck.

Mar 31, 2009 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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