High battery draw down?

TENNISSHOES

MEMBER
2013 CHEVROLET SILVERADO
5.3L
V8
4WD
AUTOMATIC
118,000 MILES

Tracking down the draw and found that a fuse that should be nonexistent when pulled the battery draw drops to 001 Milliamperes, this fuse is located between 41 and 52 in the main power distribution box. When this fuse is pulled I loose the power port and OBD port data. All the charts I have found all say that there should not be a fuse there. Any thoughts or ideas?

Tuesday, March 31st, 2026 AT 7:29 PM

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
55,281 POSTS

Hello,

The fuse position 53 is the Cigarette Lighter - Accessory Power Outlet fuse, and that same circuit also feeds the DLC/OBD connector’s power. So is there anything plugged in to those ports?

Ken

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Wednesday, April 1st, 2026 AT 9:53 AM

TENNISSHOES

MEMBER
2 POSTS

No. Fuse 53 is not where I’m at, if you look at the fuse chart and you see fuse 41 and then you skip a place and then the fuse 52, in the place that the chart shows a skip I have a fuse in the space that causes the excessive draw, removing that fuse causes my power port to stop working and the data stream also stops in the OBD 2 port. Truck runs fine. So why is that fuse there and why the excessive power draw and why the loss of data when all the ECM fuses are good. Nothing external is added to this truck.

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Wednesday, April 1st, 2026 AT 10:14 AM