OneGuyInCA

I tried to start the car this morning and it wouldn't start. It would go tick tick tick tick. I checked the battery with a volt meter and it read less than 11v. I installed a new Duralast battery. Did a reading on the new battery without the engine running and it read 12.8v. Started the car and with the engine running, did a reading again and it came back at 13.7v.

Can someone confirm that these values okay/normal? I'm trying to determine if it's the alternator or that it was truly the old battery that wasn't holding a charge and needed replacement. This is on a 2007 GS350 with about 52K miles and original Lexus battery.

GS4_Fiend

iTrader: (22)

Looks good.

toy4life86

iTrader: (4)

seems fine now but your old one maybe couldve been drained due to something it maybe coulda just used a charge because 3 years is that old for a battery

OneGuyInCA

Thanks. Here's something else.... I just did a reading on my wife's Lexus ('99 RX300, 8 yr old battery, 92K miles) and at rest, it read 12.4v and with the car engine idling, it read 14.2v.

I know that's two totally different vehicles, probably different alternator/charging system design... but 13.7v and 14.2v is a pretty significant gap? Maybe my worry is for nothing?