I have a Craftsman garden tractor with same issue. Battery was charging okay. I turned the switch off and ran an amp meter from the battery terminal to the battery and received zero mA. I had an older gentleman tell me these craftsman are known for this. I now disconnect the ground terminal from the battery after I'm finished mowing. The battery is always up to the task. not sure where, why or how this is happening but it did fix the issue. I used a stainless bold and nut so they wouldn't rust over time. Better than buying a new battery or jumping it every time I needed it. Another issue with mine that has me stomped. The battery seems to be dead, I manually turn the flywheel 1/4 turn, then hit the starter. It starts right up. Doesn't matter if the tractor was off for a minute or a week, I still have to do this. Sounds crazy but give it a try.I have a Craftsman garden tractor with same issue. Battery was charging okay. I turned the switch off and ran an amp meter from the battery terminal to the battery and received zero mA. I had an older gentleman tell me these craftsman are known for this. I now disconnect the ground terminal from the battery after I'm finished mowing. The battery is always up to the task. not sure where, why or how this is happening but it did fix the issue. I used a stainless bold and nut so they wouldn't rust over time. Better than buying a new battery or jumping it every time I needed it. Another issue with mine that has me stomped. The battery seems to be dead, I manually turn the flywheel 1/4 turn, then hit the starter. It starts right up. Doesn't matter if the tractor was off for a minute or a week, I still have to do this. Sounds crazy but give it a try.
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Re: Craftsman 21hp, 48" lawn tractor, electric start,...
The alternator is built into the starter. Check with a volt meter to see if you have at least +13v while mower engine is running. Could be a bad battery.
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I suspect that the alternator/generator has gone bad, preventing the battery from chargine, or generating enough voltage to keep the electric pto on your mower engaged.
I think that it is located on the engine beneath the flywheel.
Most Lawn and Garden batteries are the came size, if you are referring to amp rating I like to go on the larger side I believe you can get between 175 to 425 cca (cold cranking amp) batteries. On a 21 hp I like to stay no lower than 275. I have tried lower amp batteries and sometimes on start I get a hesitation.
you remove shield from engine remove belt, remove deck from mower and remove pulley guards and install belt replace guards , reinstall deck, put belt on engine pulley replace guard
it could be the stator in the engine check the voltage with the volt meter when its running if its low check connections on battery & voltage if its below 12.5 volts then its the stator but the only thing is the engine should run with-out the battery so there is something else going on there is a fuse in the electrical system if theres a short that fuse will blow & engine will stall
I have a Craftsman garden tractor with same issue. Battery was charging okay. I turned the switch off and ran an amp meter from the battery terminal to the battery and received zero mA. I had an older gentleman tell me these craftsman are known for this. I now disconnect the ground terminal from the battery after I'm finished mowing. The battery is always up to the task. not sure where, why or how this is happening but it did fix the issue. I used a stainless bold and nut so they wouldn't rust over time. Better than buying a new battery or jumping it every time I needed it. Another issue with mine that has me stomped. The battery seems to be dead, I manually turn the flywheel 1/4 turn, then hit the starter. It starts right up. Doesn't matter if the tractor was off for a minute or a week, I still have to do this. Sounds crazy but give it a try.
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