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Hi all! I am excited to find this forum! I am new to the site and has been lurking here for a while.

I got a my first riding mower and it's a ST120 with hydrostatic drive. 12HP B&S engine with 38" cutting deck. I absolutely love this mower and it's built like a tank LOL! I have ~1/2 acre lawn and used to have the Ariens 21" self-propelled mower. The ST120 definitely saves me a lot of time on the lawn.

Anyway, It's got a new battery and somehow it's not getting charged. ~12.5V when not running and same voltage when running. I have to charged it everytime when I use this mower. Is there an alternator for this mower? I look around but can't find anything obvious. What/where should I check/replace? I got the service manual online but couldn't find info on the charging system. Please help if you can. Thanks!!!
 
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