Question about 2003 Chevrolet Avalanche

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Several modules are always powered. What is the typical current drain on the battery when the key is OFF?

New battery, cables and alternator

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  • Chevrolet Master
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Hey Tom , Yes your vehicle has several Control modules on it , but They power down an go into sleep mode after 30 or 40 minuets ,till you unlock a door or use your key fob ! The most draw on the system should be no more then 50 to 80 milliamps Using Voltage Drop To Find Key off Battery Drains

Posted on Apr 16, 2015

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  • Chevrolet Master
  • 2,448 Answers

Vary low should never make no start conduition.
Sounds like you have a muility meter to ask for voltages .
Try this disconnect the negitive from the battery .Set the meter on the 20 volt DC scale .Go red lead to posivite and black to engine block or any known solid ground .If you read voltage something is shorting
If the voltage 2 -3 volts it could be switches lights ect .If its 5 volts or over then its something that draws a lot of power like a bad motor .
At any rate if you read voltage pos to gr with gr disconnect from bat their is a short .
You can try pulling fuses 1 at a time to see when it stops .This will tell you what circuit the problem is on and sometimes the starting motor will short interinaly this will kill the bat fast

Posted on Apr 16, 2015

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They can do a Parasitic Current Test -- by leaving all the doors
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IF-- you have a current draw over 50 to 60 Milli-Amps after an
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Google or You Tube Video how to do a Parasitic
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Remember once you close all doors, they stay closed
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It may take a half hour before modules time out

Best you have a wiring diagram & an amp clamp or
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Hi
A car battery can run down for any of several reasons:
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