2006 chevy trailblazer is not charging battery. battery and alt are new

2006 Trailblazer won't start - Discussion on Topix

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Sep 6, 2012 - My 2006 Trailblazer will not start, bought a new battery, still will notstart, not even with a jump. ... i get a jump i drive it and charged the battery it seemed fine but then i went ... Then, next morning, when I turn key, all lights come on and radio... back a day and 360$ well that pos still will crank but will not start. 02 trailblazer a/c problem
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an alternator charges between 13volts and 15 volts usually. it is regulated by the battery's need internally. this internal regulation is accomplished by the diode trio and or the voltage regulator within the alternator. be sure that the heavy lead from the alternator to the battery is clean and tight and that the battery terminals are clean and tight.

You'll need someone to check for a battery drain.
Something like a glove box light is using electricity when everything is switched off.

This sounds like the alt is not charging, but a eak battery will also cause this condition, what you can do is have the charging system tested. if you have a volt meter you can connect it to the battery with engine running and acc off you should have 13.5-15 volts,this is a good alternator, then turn on all acc and check it, it may have a low reading but should atleast go to 13volts and then when you rev it up it should go to 13.5 - 14.7. if the readings are low replace alternator.

clean grounds on moter and body and headlight wires

First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

Now change the sulfated batery for a new one.
Vitally

I don't tjink your a/c is directly killing the engine. The electrical load it demands may be the issue. Hve your battery checked and your alternater outout. The alt. is supposed to ofset the loads imposed on the battery so as not to ppermit the battery to drop below what is needed to satisfy other accessories which are on orrunning. The charging voltage output of the alt is 13.6 - 14.2v @ 13,6v the alt is charging near its capacity. and 14.2 it is backing off. The lower the voltage the higher the amps. Constantly running @ or below 13.6 will shorten the lufe of the alt due to hear builup damage. Have your battery load tested w/engine off. Then ck the alternater output engine running @ 800 rpms. Alternaters, unlike the old generators, charge from the minute it starts turning, where a generatoter has to have speed to generate anything. Watch what the alternator does when you turn the a/c on and off. or simply watch the battery readinsgs when you turn each accessory on. like the headlights... Good Luck

Belt turns alternator, alternator charges battery.(no belt, no charging) Charge battery with a charger. Though it may start with a jump, the alt is designed to maintain the state of charge in the battery, not to fully charge it . Therefore jumping puts too much demand on alt and can damage it. or will shorten battery life considerably.

First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!