Question about 2003 Chevrolet TrailBlazer

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Can a bad alternator cause a battery to die overnight?

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Alternator can still charge w a bad diode. But battery will drain while parkd. To test disconnect wire from back of alt..if it still drains then somethin else is runnin batt down

Posted on Apr 20, 2015

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Andrew yes the alternator will drain your battery when alternator goes bad you running all the juice on that battery change the alternator and off you go good luck

Posted on Apr 20, 2015

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A bad alternator no longer charges the battery, the battery will die once it is drained. This will occur more rapidly when using equipment that runs off of the battery( lights, heater blower, windshield wipers etc.) even electronic ignition will run down a battery. Your battery just went over night the alternator may have stopped working long before. Go to an auto parts store that offers free testing to make sure it is your alternator before making repairs.
Good luck.

Posted on Apr 20, 2015

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Hi, cold will also drain your battery over night. if your alternator has not been charging your battery for a while you would run it down gradually over time. to test alternator start car, and the battery light will go off .start car and take a terminal off the battery and car should still run if it stalls then alternator is no good. another test is to start car in the dark,put the heads lights on ( point at a wall ) let car tick over then put some revs on,if alternator is ok your lights will go brighter....hope this helps

Posted on Apr 22, 2015

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My guess is theres a short somewhere. a bad alternator will drain battery while its running because its not charging and you are running on just the battery. you might also check terminals or cables for corrosion... this may disrupt flow of electricity in or out of the battery

Posted on Apr 22, 2015

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Posted on Jan 02, 2017

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SOURCE: battery or alternator

I suggest you pull the battery and alternator then take them to a auto parts store for testing. Most major chain stores will do this for free. Another alternative is to get the car running with a jump or battery swap. After you get the car running remove the positve (red) battery cable. If the engine dies the alternator is not working. If the alternator is bad you will want to get your battery checked. The alternator going out could have damaged the battery so that it will not hold a full charge. Good Luck!

Posted on Aug 01, 2009

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SOURCE: 2006 Chevrolet Trailblazer. Battery Ok.

Hallo

have the same problem with my Trailblazer, has someone a solution ?

Posted on Jun 03, 2010

bandg963
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SOURCE: 2000 chev silverado 1500 5.3 liter alternator keeps going bad

i believe there are 2 alternator's for that 5.3 i think you need the one with the higher amps. I had the same problem and went with the higher amp alternator and i have not had a problem that was 3 years ago.

Posted on Aug 31, 2012

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03 silverado cluster went dead when battery went dead ,put new battery in and sill nothing ,can you help me


Do you own a professional type scan tool ? Would need to see if the instrument cluster can communicate with scan tool . That would be a priority . If the instrument cluster ,for some reason wouldn't be talking,checking power an ground for the cluster . Batteries going dead , changing batteries without a alternative power supply can cause modules to go to sleep permanently ! Battery Disconnect or Replacement Problems I'am not saying that's what happen to your's . 2003 to 2006 GM had cluster problems ! The solder use in the cluster caused silver migration , instrument cluster caused a drain on the battery overnight . Watch these videos !

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If a good battery is losing charge overnight then it is probably being drained by something left on! The usual areas to look at would be the boot light or glovebox light, check these or anything that might be staying on when the ignition is turned off!

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Battery was completely dead ? after how long , over night , or just out of the blue ? These year GM vehicle's 03 to 06 have instrument cluster problems , draining the battery . Do you know what parasitic draw is ? Google it . They used lead free solder constructing the electronics , an after a while it causes silver migration .
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I have just replaced my battery for my 2000 leganza and my car still keeps dying only to not start again like its a dead battery, so i want to replace my alternator. Also my timing belt needs replaced and...


You can have the alternator tested for free at your local parts store...easier if you can drive it to the auto parts store:) Sounds like it is the alternator...in rare cases the starter can have a short that causes this drain...but usually takes overnight...my guess again is the alternator...Is the timing belt scheduled for a change? This repair is not for the meek...Hope this helps.

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Left key on and killed battery. Now it dies when I come to a stop or slow down, and it doesn't idle right and dies most of the time. What can be causing this?


A discharged battery should be recharged with an external battery charger--about 2 to 3 hours with a high-current (10 to 30 amps) charger, overnight with a low-current charger (2-4 amps). Check the battery voltage after charging and the engine running--it should read about 13.5 volts if the the alternator is working. It will read 12.6 or less volts if the alternator is bad, or the fuse link is blown in the wire that runs from the alternator output to the starter solenoid connection where the positive battery cable is connected. Once the battery is charged, take the car to Autozone or similar business that will provide a free check of the battery and charging system if you don't have access to a voltmeter. Hope this helps!

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I have a bmw 2001 330ci convertible which had the alternator replaced twice in a month and half.the mechanic is claiming that there is an electrical problem and he cannot figure it out and to go to the bmw...


it seems like something is draining your battery while the car sits overnight. causing the battery to get weaker and weaker putting stress on the alternator making it fail prematurely. the dealership will do a paracidic drain test where they'll find out what is draining your battery while your car sits overnight. it could be a bad module somewhere that's staying on when it shouldn't be.

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Car cutting off ,battery or the alternator


i work for advanced auto
the altiniator can bee goood but the voltige regulator is bad

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98 Audi A6, Battery died overnight, when jumping smoke rises


Sounds like the alternator is badly damaged. The alternator will drain the battery if the regulutor or diode assembly goes out and/or the alternator is seized or locking up, which will cause the smoke (belt slippage) and drag on the engine (rough idle).

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CAR DIES OVERNIGHT!!!


When you test the alternator in the way you said you did. By removing the positive cable, you damage the ECU or computer. You are probably going to have to replace the CPU or ECU both mean the same thing. You also damage some resistors and other electronic components on the alternator itself when checking it this way. In the old cars , that did not happen because they had no CPU or ECU. Now it does.

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