Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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Craftsman Tractor Battery wont charge 917271011

I have the same problem as mentioned before, checked the fuse (30a) and have replaced the battery every 6 weeks because of this problem so I know its not a bad cell. anything else I can check?

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With the mower off, disconnect the battery from the mower and place a voltmeter on the battery terminals and check the voltage. This should be well above 12dc and the higher the better. Ideally something like 13.5 Vdc.

Reconnect the battery and switch on the mower and then check the battery voltage again at idle. This should be above 12Vdc and should be in the region of 12.5Vdc to 13Vdc.

Now rev the engine while stationary and check the voltage again. This should be significantly higher that it was when the mower was on idle or switched off. This should be somewhere between 13 and 16Vdc If not then the alternator is defective and if you have a charging circuit regulator unit fitted this may be defective.

If the voltage is considerably better than when the mower was on idle or switched off then there should be no problem with the charging circuit.

If you have changed batteries that often are the ones you are replacing it with of the correct capacity and CCA Cold Crank rating? If not then these can degrade very quickly. What I do with my mowers is to take the recommended rating and add up to 10% for the nominal and CCA currents and these just go on and on! Don’t be tempted to increase the capacities any further because the charging circuit will never be able to cope with the battery demand.

Posted on Sep 26, 2009

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