Maybe somebody can help me with this. Have a 2008 Husqvarna FS 520 floor saw with a GX620 Honda 4 cycle engine, 220 hours. Started cranking slower and slower and finally quit cranking without booster cables. Fresh battery will last a couple days, so I think it isn't charging. I've checked all the wires on the outside of the engine and they seem to all have good connection and are plugged in. I haven't dug inside the engine yet, so I'm not sure what even charges these engines. Any one experienced in these engines that might could get me started on the right track? Any common fixes? Thanks.