Question about 2003 Chevrolet TrailBlazer

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Faulty alternator or not

Display says battery not charging dont know if its the alternator or a short somewhere

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Its the alternator for sure. this display light is directly wired to the alternator.

Posted on Mar 07, 2009

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Posted on Jan 02, 2017

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Check wire going from alternator to battery could have a short. Did you replace belt and tensioner it

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Take the car to an autoparts store and have the alternator tested. While the output is being checked, move the wires around and see if it affects the output. I had a wire shorting out in the plug once that was intermittently causing the alternator to not charge. I ended up soldering the wire into the plug and it stopped the problem. If the alternator is not charging the battery, it is most likely either a short in the wiring somewhere or a faulty voltage regulator. Hope this helped and best wishes.

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The alternator is okay but is short circuiting on the battery.

trouble shoot by using a friend's battery and you will experience the same thing.

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Replace the alternator.

Dont forget to rate this.

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I would say that this may well be a coincidence. The alternator had its own circuitry in it to regulate its output wich, i suspect, is the problem...the good news is that many ap stores can test an alternator on site so you know for sure before spending your money; better yet bring it to a real expert- and auto electric shop- the rebuild alternators and electric motors on site as well as test and diagnose the alternator for you.

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1 Answer

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It sounds like a short somewhere in wiring draining your battery. You might try a different alternator it mite be faulty

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