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Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 16769
Experience:  GCM master tech over 25 years
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I have a 2006 Sierra PU. the battery drains to dead in about

Customer Question

I have a 2006 Sierra PU . the battery drains to dead in about a week. Key is off. Sparks when you disconnect battery cable . "?"
Submitted: 1 year ago.
Category: GMC
Expert:  Gary replied 1 year ago.

I am sorry your having this problem

when a battery will go dead like this the odds are there is a draw on the system

has a draw test been done yet ?

Customer: replied 1 year ago.
NO Don't know how to DRAW test
Expert:  Gary replied 1 year ago.

do you have a multi meter on hand ?

what has to be done is a multi meter set to amps needs to be connected in series on the negative battery cable and see if the mili amp reading is 50 MA or higher if so and NOTHING is left on or nothing is one when it should be off inside the truck is one fuse is pulled at a time until the draw drops below 50 MA then what ever is on that fuse is causing the draw which on these the usual draws are the BCM or radio and a few with bad gauge clusters not turning off when the truck is off killing the battery