4mula_J87

I went to lexus and was told my battery was bad. So I replaced the battery and the new battery keeps dying so I replaced the alternator. And now every morning I have to jump the car. I did a parasitic drain test and nothing came out of the ordinary. The battery goes from 12.4 to 10.2 in about 30 minutes of nothing on and it idles at 13.4-13.6. Am I missing something?

604GSE21

my 350 during cold starts it goes to 14.1v and once it is warmed up it hovers around 13.5v

nosurprise

iTrader: (1)

Last time I checked, my car hovers around 13.4v.

If you're confident with your battery drain test and the battery goes from 12v to 10v in 30 minutes, then the battery is bad.

DennisMik

You have a bad battery. The voltage should not drop like that if there is no current draw. Double check by disconnecting the battery cable when you park the car after the car has been running. If the voltage is 12.4 when you disconnect the battery, it should still be 12.4 volts 24 hours later.

maeveLexi

Check your battery cables too.
Same thing happened to me couple months ago.
Turned out my negative cable was stripped and I had to re-solder them.
Clean the terminals while you're at it as well.