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Old 12-14-2017, 12:17 PM   #1
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Melissa_M has a spectacular aura aboutMelissa_M has a spectacular aura aboutMelissa_M has a spectacular aura about
Join Date: Jan 2008
Posts: 728

1999 SL2
Default battery drain

My (interstate) battery is about 2 years old.
I just did the starter recently (october), and iirc I charged the battery at that time.
I use torque/OBD and have an innova scanner, and NEITHER one will show me the battery voltage. So I periodically have to check with a MM because I sometimes go a week or 2 without driving, and it's always short distance.

It's been a week or 2 since I drove the car, and just measured 7.6V with my MM. Had enough juice to be able to get the power door unlock/alarm with the fob. I do keep the OBD scanner unplugged. Occasionally my door doesn't get closed all the way, and that was not the case here. In those cases I think the battery usually measures 0V?(I have also turned the dome light off, I don't remember if that makes a difference with the door)

So why is my battery so low, but not dead?

I have had this nagging feeling for a while that I have battery issues, but it's kind of hard to monitor - because the OBD doesn't show me the value and I drive so infrequently.

Added bonus - my battery charger is squealing/buzzing, and just out of warranty.
It indicates I have it connected properly (attaching the neg is always tricky for me) but the light that shows it is actively charging hasn't come on. I think it takes a while when the battery is so low, but that noise is a bit worrysome.

1999 SL2 MANUAL ~76K


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