How do you check for battery discharge when car is off?

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mattd1979
Posts: 710
Joined: Fri Oct 29, 2004 6:08 am
Car: 1990 Pearl White Q45 plain Jane with 266,000 miles. 2015 moonlight white metallic Q70L with 20” wheels, sport brakes and a 5.6L at 58,000 miles.
Location: Jacksonville

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My Mom's '91 loses voltage over night and has to be jumpstarted. I checked the door switches and the interior lights go out when the doors are closed. The battery was replaced about 3 months ago with an Infiniti battery that my Dad picked up from the Infiniti dealer. Anyways, How do you check for battery discharge with the volt meter? I want to compare the readings that I will get from my '90 that my Dad will get from their's.


fourdrinie
Posts: 538
Joined: Thu Mar 03, 2005 8:23 am
Car: 2019 Q50

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captainluigi
Posts: 679
Joined: Wed Nov 02, 2005 4:15 pm
Car: 1996 q45t
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fourdrinie, thanks for the excellent site.


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