Question about 2003 Chevrolet Trailblazer Ext

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My Chevy Trailblazer drains my battery and won't recharge it.

We have replaced the battery and the alternator. We thought it may be the new battery and had it replaced. Non of the above. Now what? It runs great when you get it started. We make sure everything is off when we start it. We put a charger on the new battery to get a full charge also. Nothing seems to help. Any ideas?

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  • Chevrolet Master
  • 2,196 Answers

I cannot come and see what is causing your battery drain, but I think you might help yourself by removing one of your battery cables each time after you shut off the motor, and reconnecting that cable each time you wish to start the car. Pick the cable that is easiest to unscrew and screw back on. The on boarde computer will not like this solution, but until you find a shop that can fix it, this will at least get you out and home again.
As a test, when you hook or unhook the battery, any spark you see between the cable and the post should be really tiny, or you have a bad short somewhere.

Posted on Jan 05, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

  • 396 Answers

SOURCE: 2003 Chevy Express 2500, runs GReatbut battery drains dead 2days

Have the alternator checked. An open diode will drain the battery

Posted on Jan 30, 2010

mosthated357
  • 91 Answers

SOURCE: 1996 Chevy Blazer battery draining/won't start

What normally you have to look for is that your belt is running properly because your car might be running a lot more off the battery and not so much of f the alternator, but normally if the alternators bad it will drain the battery even if the cars not running.. Yes your first thing you would want to do is check the wiring and al that just because thats cheap and easy but most likley you wanna get the altenator tested...you can get that done at advance auto.. please rate me if you get a chance and if you have any other questions just let me know ill check up on your problem..

Thanks,
Steve

Posted on Jan 03, 2009

  • 1 Answer

SOURCE: Chevy Trailblazer 2003 ran the battery down now wont idle

try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

Posted on Dec 18, 2008

  • 6982 Answers

SOURCE: 2001 chevy silverado 1500 v8 battery drain after sits for 1or2day

, do a simple test on the charging system...check battery voltage. should be 12v or better. start engine & check volts at idle, no accessories on. volts should read 13.5 -14v. Turn on all accessories(including headlamps on high) volts should drop slightly but should not creep down. Definitely not below 12.5. If voltage drops lower than 12.5, the regulator (in the alternator) is not working. either change regulator or change entire alternator. Alternator drive belt should have sufficient tension so that alternator cannot be turned easily by hand. If it can, check belt tensioner.

Posted on Mar 18, 2009

  • 167 Answers

SOURCE: 01 Suburban battery draining

take it to an autosparky ......They will check to see if there is a drain on the battery.
cheapest and fastest option.

Posted on Jun 26, 2009

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