2002 impala battery drain

04-03-2015, 03:58 PM
Car has a drain that kills battery over night. Fuse for cluster/BCM in driver side fuse panel gets rid of drain. Didn't know if there is a common issue for the car to look for . Thanks

04-04-2015, 08:59 PM
None that i have heard of, so the fuse is for the BCM ?

04-06-2015, 11:43 AM
In owners manual it says cluster/ BCM for that fuse

Blue Bowtie
04-06-2015, 08:11 PM
Is this the 10A fuse? If so, what is the current draw in standby mode? If if is over 50 mA there may be a problem. However, initial current after shut-down and for about five minutes afterward can be higher. It should drop to 35-50 mA after that.

04-07-2015, 07:32 AM
Yes it is the 10 amp fuse, it draws 1.64 amps all the time and kills battery in a few hours(overnite)

04-07-2015, 11:29 AM
I checked all the normal stuff < glove box , truck and hood lights to make sure they are going off. Unplugged the truck latch and made sure the interior lights cycled out(also that the cluster lights shut down.

04-07-2015, 01:04 PM
Bad diode in the alternator can cause battery drain but still provide proper charging voltage during testing.

04-08-2015, 11:23 AM
Not the alternator unwired it still had drain

07-22-2015, 10:25 AM
This may sound dumb but start unplugging items in that circuit. If the drain stops watching a VOM for indication then the part you unplugged is at fault. Process of elimination.


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