Exmark Lazer Z 22hp L/C Kawi .... As stated above it starts discharging only when the blades have been engaged for a while and it will drain the battery fairly quickly. If I let it run without the blades engaged it will charge back up. I replaced the battery, and the alternator with a rebuilt one regulator is mounted on it. I checked and changed a few safety switches, which don't appear to have anything to do with this problem. Any suggestions Is it in the pto switch...clutch.... I'm stumped and this is the one thing I'm terrible at diagnosing electrical problems. Just to let you know I put ona rebuilt alternator which was $160. a new one from Exmark was $365 I think. The only thing I was unshure of was the regulator it looked identical but did not have any writing on it volts , amps etc Thanks for any help.