Battery discharges in 3 weeks (1 Viewer)

Joined
Jan 20, 2010
Messages
57
Location
Asheville, NC
Not sure if this is normal or not. If I leave the LC in the garage for three or four weeks with the doors locked (or unlocked - I've tried both), the battery (only six months old) keeps discharging completely. Does the security system draw THAT much power, or should I start looking for some other source of the battery drain? I recharged the battery the first time it happened and drove to AutoZone to double check the battery and was told it was still perfect.
 
Joined
May 8, 2004
Messages
959
 
 
 
If you remove the battery negative cable from the negative post, and place a test light between the floating ground cable and ground post, as a quick general rule of thumb, if enough power is being drawn to illuminate the test bulb, then you have a parasitic draw that requires attention. You could also use a multimeter in place of the test light to see exactly what the current draw is.
 

Copenhagen1

1000+ Club
Joined
Feb 9, 2006
Messages
1,267
Location
East Texas
 
 
While testing you need to make sure all doors are shut and if there is a pin switch for the hood make sure it is pressed in (closed).

If you do have a reading on the meter, you have to start pulling fuses and replacing them until you narrow it down to which circuit has the 'leak'.
 
Joined
Oct 26, 2009
Messages
688
Location
Newton, MA
 
 
I had this same problem, except my battery would discharge after only a few days of sitting. I have lots of aftermarket electronics installed so that's where I started with the test light and multimeter. Turns out the culprit was an incorrectly hooked up relay for my NAV-TV unit that never turned off. If you have any aftermarket electronics installed, start there first.
 

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