Question about 2005 Chevrolet Avalanche

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Parasitic drain 2005 avalanche

Red top keeps going dead if not ran every couple days. Battery 100% good!

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Remove the positive cable from your battery then connect a test light in between the cable and the terminal of the battery. at this point it will be lit up. if you have an under hood light the bulb will need to be removed as well as the radio fuse and unplug any thing from the cigar lighter. remove the dome light fuse. if the test light is still lit up then you have a parasitic drain. the first thing i would do is remove the large red wire from the back of the alternator as a shorted field is the most common form of parasitic draw, if the test light is still on and are sure that everything is off and unplugged then start removing fuses one by one while checking if the test light is still on. once the test light goes off then you have found the circuit that is causing the draw. repair will depend on the circuit

Posted on Jan 20, 2013

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Posted on Jan 02, 2017

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SOURCE: 2005 Avalanche Cranking/Climate Control problems

DISCONNECT THE ECU FUSE FROM YOUR FUSE BOX. WAIT 15 SECS AND THEN RECONNECT AND START YOUR VEHICLE.

Posted on Dec 22, 2008

  • 54 Answers

SOURCE: 2004 suburban 1500 battery keeps going dead

Something is obviously putting a drain on the battery, if all the things you had checked are good. If you disconnect the negative terminal on the battery touch it back, it should spark a little, but not alot. If it sparks quite a bit you know something is staying on that shouldn't. Possibly a glove box light, or if your truck has a light under the hood the mercury switch in it may have gone bad causing it to stay on. If it's taking 8 days to go dead you'll be looking for something small. I hope this helps.

Posted on May 10, 2009

  • 118 Answers

SOURCE: battery keep going dead, has new battery

Have you checked to see if the alternator is charging ? Run a volt meter on the battery with the engine running, have to have more than 14 volts. If 13 or less, then replace the alt.

Posted on Jan 18, 2010

  • 85 Answers

SOURCE: battery goes dead in 8 hrs..disconnected

If you have a multimeter then put the negative lead to a good frame ground and the positive lead to the negative battery terminal and set the multimeter to measure 12VDC. With a "parasitic drain" you should be able to see some voltage. Next start by removing then replacing one fuse at a time and when you remove the fuse for the circuit with the drain you should no longer be able to see a voltage reading on the multimeter. Check which system the fuse was for and then isolate which component in the circuit has the problem.

Posted on Jan 26, 2010

  • 167 Answers

SOURCE: My 03 Silverado has parasitic battery drain. VOM

Disconnect the auxiliary power cable from the under-hood distribution center that runs to the anti-lock brake controller. Remove the ignition relay from this distribution center (this will isolate/eliminate/indicate the problem as the ignition switch). Unplug any GPS add-on device, and any radar detector, stereo amplifier add-on, I-pod, trailer brake controller add-on, anything that did not come on the truck from the factory. These can be frustrating.

Posted on Feb 13, 2010

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this is called a parasitic drain. It could be a trunk or glovebox light that isnt turning off.

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There is a strong possibility that you may have what is called a parasitic drain on your battery. Which simply means that there is something running in the background that is pulling a load on your battery. These kinds of drains can extremely hard to find. To help you determine of you have a parasitic drain you will need a multimeter. If you do not have one I would recommend taking your vehicle to a trusted automotive service center. Call then first to determine what they charge per hour for diagnostics. usually will be about 1 to 2 hours diagnostics time.

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Battery keeps going dead


I do not know what it is drawing for parasitic drain but it should only consume about 30-40 milliamperes (mA) of current. If it is draining the battery that fast there must be a problem. If it is equipped with any aftermarket equipment, that is where I would start.

When trying to trouble shoot parasitic drain you need to hook up an ammeter (measures current i.e amps) between your positive terminal of the battery and the positive cable (make sure it is not still connected to the battery). For this you should use a good quality meter that is capable of measuring small amounts or current. All lights and equipment should be turned off and the ignition should be off.

Once that is done your meter should read whatever the parasitic dray is. Watch your meter and begin systematically removing fuses, do this one at a time and make sure to replace them. Once you remove a fuse and the current drops you have isolated the faulty circuit.

Once you have isolated the faulty circuit you can further trouble shoot that circuit by disconnecting specific components that are powered by that circuit.

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