Every Morning battery drainage?

BRIANOT33

MEMBER
2003 CHEVROLET SUBURBAN
8.1L
V8
4WD
AUTOMATIC
148,000 MILES

Hi I have a 2003 suburban and every morning I get up to start my truck it doesn't start I did a draw test and it is pulling current but its not in either fuse box not the alternator nor the starter had it checked plus the battery is brand new could someone please give me some answers thanks

Monday, January 19th, 2015 AT 11:33 AM

2 Replies

HMAC300

MECHANIC
48,601 POSTS

All modern vehicles will have a draw that is slight. If it is a heavy draw unplug your abs unit it may be coming from there. If it is they can be rebuilt.

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Monday, January 19th, 2015 AT 12:02 PM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Did you try unplugging the rear wheel steering control module? this is the only thing that is not in the fuse panels that you checked. Here is the wiring diagrams for the main power form the battery's so you can see what I am talking about. If your car does not have power steering I have seen the AC compressor relay stick on and drain the battery right down. This guide can help as well

https://www.2carpros.com/articles/car-battery-dead-overnight

Here is the location of the relay so you can remove it to see if it makes a difference.

Check out the images (below). Let us know what you find.

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