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I have a 2004 chevy tahoe every week i go and recharge the battery .Something is draining out my battery

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  • robertguz924 Jul 18, 2010

    2004 chevy tahoe battery drains out every week did a A/C voltage check read 30.7 and a D/C check read 14.1

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Your best choice in solving this delima is to get your hands on a volt/ohm meter. They can be found at Auto Zone very cheap for $10 & under. You will have to run this test to see IF I am right which I am inclined to beleive this will be your problem. Recharging the battery every week tells me your alternator is getting weak. A componet inside this that controls the direct current is the diode. If it starts to go bad the charging mode of the alternator is not 100%. This will cause a discharge of the battery.

With the volt meter in hand and the engine running connect the meters probes to the respective battery terminals. Red on Positive and black on negative. MAKE SURE THE VOLT METERS SETTINGS is set to the DC mode before connecting to the battery.

You should get a result such as 13.5 volts if the alternator is working well. If lower than that the alternator is not producing a full charge as expected.

Now Remove the probes from the battery. Now switch the DC switch mode to the AC mode. Now install the probes wires to the battery by Red on negative and black on positive. Sounds crazy although if a reading hows up in a number form the same as it did before in the first test above the alteratoer diode is shot letting the current flow in reverse which is a ALTERNATING CURRENT. Vehicles will only get a charge in a direct current. That is why your battery drains throughout the week. Eventually the battery will be destroyed from the coils and spark plugs sucking all the engergy from it.
If I am correct many repair shops that rebuild these can repair yours a lot cheaper than purchasing a rebuilt one. The yelloow pages my show a shop that does that. Auitomotive electronics in the yellow pages may work to find a place in your town
Good luck

Posted on Jul 17, 2010

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  • Master
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This is a problem that sometimes can be a real pain to locate....take the positive cable ogff the battery, in between the positive line insert a test light 12 volt vintage, when a draw is present the light on the test light comes on and should be lit right now as you hook it up.
One by one pull a fuse and watch the light, it should go out when you hit the line that is drawing on the battery.
Here are two quick tips for what are usually common things to drain the battery...first one is the under hood mercury light or under trunk lid mercury light, if they are lit when the hoods are closed you wont see the light and in the morning wake up to a dead battery, disconnect them one at a time over nite first to see iof the problem goes away, if it does with either one disconnected then replace the light with a new one which is sold at Auto Zone or any Parts Store.
Next look toward the alternator, with the test light in the line and on, disconnect the alternator feed line(larger wire on the baxckside of the alternator may be a 3/8" nut or a 10 MM, remove with a socket and determine if the light goes out when disconnected...if yes replace the alternator, last but not least on the common parts to drain the battery is the simple quiet and out of the way brake light switch which may be on when you leave the vehicle parked and will definately cause havoc on the battery, last is the interior lights and the headlights not being turned off after the car is shut down...please test all these first before going fuse by fuse, as I think one of these items are your culprit.
I hope this works for you.
Happy Motoring!!

Posted on Jul 18, 2010

Testimonial: "for the altenator test should the engine be on. if the brake light switch is bad and stays on shouldnt the brake light stay on. just asking before i start testing"

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  • Chevrolet Master
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Draws are hard to find,,first thing to do,is,if you have not ever removed the battery cables,do not,if you have there is a draw test you can do,but if the cables are removed,this can erase the memory of the computer,and that means no start,and the dealer will have to reprogram the computer,but if you have had the cables off the battery,then you can do this test,if you want to let me know,I am standing by Ron.....

Posted on Jul 18, 2010

Testimonial: "yes i have unpluged the battery every time i had to recharge it. this has been happening 5 weeks in a row."

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 18, 2010

    If you are getting a ac voltage of 30 then the alternator diodes are bad in the alternator,unplug the alternator,this is the problem,replace it.

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