Question about 2008 Chevrolet Uplander

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Battery is completly discharged overnight. jump started and tested with no draw.

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  • Chevrolet Master
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Sounds like someone left the door open overnight... or the key in the ON/run possition?

If there is no draw with the battery fully recharged.. this is the only thing I can think of that would cause this condition.

Posted on Mar 31, 2011

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1 Answer

Why would a battery discharge overnight


A parasitic draw on the electrical syatem . Depending on the vehicle , make ,model an year a control module could be bad or didn't go into sleep mode , something could be on like a light or someother load on the system , a short in the electrical system . How To Perform Parasitic Draw Test EricTheCarGuy

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If I leave pickup 8 hours, why is it dead and has to be jump started?


Sounds as if there is a parasitic draw on the battery. You need to perform a draw test to see what amperage is being drawn from the battery while the vehicle sits. Anything more than !/4 amp will kill the battery overnight. Check for any lights that may be staying on inside the vehicle as well as outside the vehicle while it is shut off before getting involved in a draw test

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Truck keeps dying, dont know what else to do?


12.6VDC is a good output from a vehicle battery. The measurement of 8.8Volts is not drawing anything, it is Voltage not current...you can draw current in Amps or Watts only. Check the Amperage draw of your Amplifier to see what it draws and compare that number to the number of Amp Hours written on the battery. Yes, it may be what is draining the battery, like leaving your headlights on overnight! Do the math! Drawing the battery down to a very low Amperage could damage the cells in it, that's why golf carts use what is known as Low Dwell batteries that can discharge way down without damage. Have it tested or test it yourself with a relative gravity tester available at your local auto parts store. Read the instructions carefully...it will tell you how bad the battery is damaged and if you need a new one. Have fun learning stuff like I do...

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One day my 1999 Dodge ram 1500 truck will start and if i leave it over night the next morning I will go out and it does not start, have to jump it. Changed alternator as well as new battery


Sounds like you have a draw in your electrical system. You will need a multi meter capable of measuring amperage. With the key out of the ignition, and the doors closed disconnect the positive cable from the battery. Hook one lead of your meter to the positive post of the battery. Place the other lead on the positive cable end. You should see less than .050 amps. Anything more and you have a draw. You will then need to pull fuses one at a time until the draw goes away. Then you can focus on that circuit to see what is causing the problem. Typically aftermarket radios, glove box lights, heated seats, and vanity lights are pretty common sources of draws. Let me know what you find and I'll see if I can't help you further.

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2007 Suzuki Forenza Replaced the battery a year and a half ago. Replaced it year and a half later. Week and a half later in the morning the battery is drained. Had the alternato, starter, and battery...


It would appear as though something is causing the battery to discharge - check things like the light in the trunk - make sure it turns off when you manualy simulate the lid opening and closeing. Also try disconnecting one of the battery leads then touch it to the terminal when everything is switched off - there may be a very slight spark because of the clock. If the "spark" looks much more then this proves something is drawing current from the battery which explains why it is discharging overnight. If you have after market hi-fi or any other toys then try disconnecting them if you see they are drawing power when everything is switched off.

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1 Answer

Mysterious battery drain


you not only should be getting tired of jump starting your car, you battery is also .. modern batteries can only be deep discharged a few times .. so each time you allow it to do that you have removed a significant portion of the batteries life ... usually the problem is caused by a light not turning off ... like the trunk or under hood light .. even the glove box light .. in your case of overnight discharge i would guess that something is drawing about 7 amps .. thats more than most lamps .. now since you have had trouble with your rear defroster i am suspecting that it is staying on .. there is a relay that controls that .. that relay may be stuck on .. feel the defrost element to see if its warm . you can disconnect that defroster or pull its fuse to test that theory .. also you can remove bulbs to see if thats the problem .. once in a while yoiu see a shorted diode in t he alternator (even new ones) .. that should have been tested when they installed or tested the alternator .. since the current is so high then whatever is drawing that much will be warm to the touch .. until you find the problem, you have little choice but to disconnect the battery each night or hook up a charger .. one way to trouble shoot if you dont have equipment is to do the following:
1. disconnect the battery
2. clip lead a small 12volt light bulb between the battery and the connector ... the bulb might glow dimmly ..
3. if somethng is drawing lots of current then the bulb will glow brightly .. disconnect things one at a time until the bulb dims.

many auto parts stores have test equipment that can test for leakage .. they wont have time to troubleshoot but they can tell how much leakage there is ... that service is often free ..

Jun 23, 2010 | 1994 Geo Prizm

2 Answers

Car will start after being jumped. the next day


you need to find out what is drawing on the battery you could have a bad alternator and the car is just running off the battery give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

Jan 02, 2010 | 1998 Chrysler Concorde

2 Answers

Needs jump


Check the battery for charge and alternator for power (free at Autozone) It might be deposited/rusted contacts on alternator and battery to reduce the electric current to battery from altrnator so battery just draining out. Also if it is very cold overnight (less than 0 F) battery lost the cranking power.
Please kindly let me know if the information provided was usefull for you or you need more info
Good Luck

Feb 05, 2009 | 1999 Ford Explorer

1 Answer

Battery drains overnight


First thing you need to do is make sure battery is fully charged & have it load tested. If that and the rest of your charging system checks out, then you'll have to test for a battery draw, when vehicles off.

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