Question about 2002 Chevrolet TrailBlazer

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I have a 2002 Chevrolet Trailblazer. I just bought a new battery last week. However when I would go to crank it up in the morning it won't start. I have it jumped by my brother's car and go to the Auto Parts store. They test my battery and electrical system in which both are good. I go to a firestone shop and have my electrical system tested. The electrical system such as starter,alternator are excellentthe battery is also. So something in my Trailblazer keeps draining the my battery. I guess that it may be the security system or factory radio/stereo. I really need some light shed on this issue with my Trailblazer

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  • camop75 Jan 04, 2011

    I really don't understand the terminology.Could you explain in simple terms especially the circuit draining system part?

  • camop75 Jan 04, 2011

    have a 2002 Chevrolet
    Problem with the Chevrolet TrailBlazer 2002 TrailBlazer
    I have a 2002 Chevrolet Trailblazer. I just bought a new battery last week. However when I would go to crank it up in the morning it won't start. I have it jumped by my brother's car and go to the Auto Parts store. They test my battery and electrical system in which both are good. I go to a firestone shop and have my electrical system tested. The electrical system such as starter,alternator are excellentthe battery is also. So something in my Trailblazer keeps draining the my battery. I guess that it may be the security system or factory radio/stereo. I really need some light shed on this issue with my Trailblazer

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2 Answers

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Hello camop.
When I have a vehicle come into my shop with a battery drain I hook up a meter that reads amperage in a wire.
If excessive drain is noted I look for some obvious problems such as interior lights, glovebox lights and so forth.
If the obvious isn't, I then start pulling fuses one at a time until the drain is gone.
Then I look at that fused circuit and find out why it is doing it.
Sometimes easy, sometimes not so easy.
But it will be a process of elimination.

I hope this helps shed some of the light for you.

KL

Posted on Jan 04, 2011

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The only way to properly test for a drain is to remove battery cable and hook an amp meter between cable and battery and measure draw. keep in mind it will have some draw for a few minutes till it goes to sleep. pull fuses until draw drops and this is circuit draining system

Posted on Jan 04, 2011

  • TripleTauto
    TripleTauto Jan 04, 2011

    the vehicle will have a slight drain around .5 amp or so this is for radio memory and such. if it has more the battry will drain down if it is going dead overnight it has a pretty big drain on it. the amp gauge tells us the current flowing thru system, and removing fuses will isolate the drain when the one is removed and amp reading drops down you will know it is this circuit. a wiring schematic will be needed ans knowlwdge of the electrical system. a firestone store does not have a tech certified in doing these repairs i would recommend finding a reputable shop and have them look at it.

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