2013 Chevy Tahoe Z71 PPV Outfitted, Battery drains overnight.

[kylebnoris]

Is the battery more than 3 years old as well? Could it be a dying battery?
The current draw numbers you show seem to be in the acceptable range?...

Battery was replaced in January, 12.3 was my reading but this is not after a charge. It was when I showed up on site. Guy said the battery charged and tested fine at the local parts store prior.

 

[kylebnoris]

Instead of pulling fuses, have you tried measuring the voltage drop across the fuse test points (at least the ones you can)? That might help pinpoint what circuit is still awake. Plenty of YouTube videos on this method.

Depending on what aftermarket equipment is installed, the fully-asleep draw should be no higher than 50 mA, but 20-30 mA is more like the norm on a stock system. If it has an aftermarket alarm system, etc., YMMV.

Yeah so it was pulling 110mA immediately when connecting leads but slowly drops to about 60 then eventually through out pulling fuses (to hopefully see an immediate difference in draw and pinpoint AT LEAST the affected system/circuit)

It eventually settles in between 49-48mA

KOEO of course.

 

[mikez71]

12.3V seems good?

You could try disconnecting the BCM fuse and see if the draw is 60mA right away..
(just to verify that the 110mA is retained accessory power)

If 50mA is acceptable, is a 60mA draw going to drain the battery overnight? (serious question, seems like it shouldn't)

Is it only not starting? or are the lights dim too?

 

[kylebnoris]

12.3V seems good?

You could try disconnecting the BCM fuse and see if the draw is 60mA right away..
(just to verify that the 110mA is retained accessory power)

If 50mA is acceptable, is a 60mA draw going to drain the battery overnight? (serious question, seems like it shouldn't)

Is it only not starting? or are the lights dim too?

The time scale for it to drop is odd, it's immediately 110 then drops down to eventually 49 but it isn't slow enough to watch etc.

It seems to drop steady when the BCM fuse is pulled or if it's installed, so I don't think it it's the BCM. There isn't a immediate difference.

Lights in the interior when it's was at 12.3 were fine. No issues starting.

 

[kylebnoris]

Bump,

Once I localize the issue in a circuit via parasitic draw testing through yanking fuses or disconnecting equipment I'll run a voltage drop test after I make sure it's getting power, and OHm's out right.