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So my battery was dead last grass season, I kept jumping it off to cut the grass. This season I go to do the same and it fires right off with the jump start but when I take the leads off the mower shuts down. Is this due to the battery being bad or is it a cause of another problem?

@jsimmons92 this"when I take the leads off the mower shuts down" happens when your alternator does not work. It will not charge any battery and will not provide the electrical power needed to run your engine. We really would need to know which engine your mower has in order to help you further. Update (04/20/2022) @jsimmons92 sounds something like a SV541 Courage model. Most of those are equipped with either a 9 or 15 amp, regulated battery charging system. Some have a 3 amp, regulated system with a 70 watt lighting circuit. You’d be looking at the rectifier regulator by the flywheel. I attached the SM for you. Page 35 and on will tell you all you need to know to fix this. Kohler SV470 Thru SV620