Hello, I have a 2000 LS400 and this all started about a month ago. I left a dome light on all night and in the morning it would not start so I got a jump start and drove it for for about 17 hrs only shutting it off a few times. And all those time it started good. Anyway I got home and charged the battery put it in drove it around a bit parked it for a couple days and again it would not start, So I had the battery checked and it was shot. Ok so I changed the battery, correct size optima 750cca battery. Everything worked good for a while, But because I can I checked the charge of the battery 2 weeks later and it was at 75% charge {12.4V} so I charged it back up and drove it again. Ok so 2 weeks passed and it has a tough time starting this am, got it started drove it to advance auto, had them check the battery and alternator. Late I know but better late than never right?? anyway the battery was low very low 12.09V or like 35% charged and the alternator output no load was 14.08v and 11.1A and under load it was 14.11V and 10.3A the guy and his print out are telling me the charging system is fine. And there was no parasitic drain, the printout says 0.00A but a friend tested it with a fluke meter and got .006A I think, But he said that was totally fine. My question is whats going on? Shouldn't the alternator be putting out way more than 14.11 volts with a load and a mostly dead battery?? I figured I killed it driving back home a while ago, but the tests say otherwise?? I am charging the battery tonight and will have it rechecked tomorrow but I would still like your input. Thanks Pat