Question about 2007 Chevrolet Tahoe

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Changed battery and alternator i week ago the battery gauge plays between 14 or less and when we turn the car off the whole car goes dead and wont start then when we wait a while it starts

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When you say it's dead, do you mean that no lights, no accessories work? Or just the starter doesn't work? Need to get a little more info before trying to help. Could be a starter issues, or a maxi fuse issue. Doesn't sound like the alternator or battery issue (unless it is battery terminals or ground) since it will "work" after you wait.

Posted on Nov 15, 2010

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You may have a bad battery or alternator, its best if you take in to the Auto parts store where you bought the Battery and Alternator to have them check it on your vehicle, they have tools to test the charging power from the alternator as well as to check the battery condition. Just because their new does not mean they are always going to work.

Posted on Nov 15, 2010

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Yes it sounds like the alternator voltage regulator is wearing down and needs to be changed or replaced.

If you can get your hands on a 12 volt multimeter, turn the setting to 20 dc and place the negative wire on the negative battery post and the positive wire on the positive battery post.


The battery with motor off should be 12.6 volts and higher, start the the car the read out should be 14.,2 or higher.


You can turn the lights and heater on to see if the alternator can cope with the load.


if read out is less then you need to change or replace it.

Cheers

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