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Battery loses charge overnight - 1998 GMC Sierra

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Either you have a bad battery, dirty connections or you have a parasitic drain. go to your local parts store for a battery test .to test a parasitic drain you need a multimeter. disconnect your negative battery cable. put your meter in the amperage setting. hook one lead to the negative cable and the other lead to the negative battery terminal. make sure that the cable is DISCONNECTED from the battery or you will blow fuse in meter or blow meter. read your meter. if it is anything over .5 amps or 50mA then it will fail the test. to figure out where the drain is coming from start pulling fuses. pull a fuse and put it back before pulling another. if the readings drop below the .5a then the problem is in the circuit of the fuse you just pulled. from then on it depends which circuit it is to determine the problem.

Posted on Apr 10, 2011

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New alternator,battery, starter but battery dies overnight and hard too boost shop tested battery and alternator both check good???


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Light on dash reads "check


nancycmixon, When you see this "check your charging system" you need to have the alternator checked. This is the main component for the charging system. A normal alternator will put out 13.6 to 14.6 volts. A few tenths of a volt either way won't mean too much but if they are extremely over or under these values means you have a bad alternator. I believe that your vehicle has a voltage meter in the dashboard and it will usually read in the thirteen to fourteen volts range. As far as your battery losing its charge overnight means that you have another problem and that is you have what is called a parasitic drain. There are a certain amount of parasitic drains already in the car with the radio memory and maybe a clock that constantly displays the time and the antitheft system in the car. These will not drain your battery overnight. You have something else draining your battery that is your problem. Have the alternator checked and mention the battery drain. There is test for this but it is too lengthy to post here. Sorry about that. Good luck with this.

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1 Answer

I HAVE A 2001 VW BEETLE.EVERY MORNING I HAVE TO JUMP THE BATTERY OFF.I CHANGED STARTER,ALTERNATOR IS OK.EVERY MORNING IT MAKES A CLICKING SOUND BEFORE JUMP IT OFF.


Have your battery load tested. It sounds like overnight it's slowly losing it's charge. Another possibility is something electrical is "on" or draining battery overnight.

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My battery will not keep a charge on my 1995 oldsmobile aurora. the alternator is not bad


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I have a 2004 Hyundai elantra. When driving all my gauges turn off including my odometer and speedometer. My car loses power and the automatic trans. has trouble shifting. My battery completely dies,...


I am having the same problem with my 2004 Elantra. I have had the alternator tested twice and did replace the battery. This morning I had it running ad put a volt meter on it ( red to the battery pos black to the engine block) I did get a reading of 14 volts for about 30 seconds then the idle lowered and the voltage dropped to 12 volts. I tried this again later but could not get a voltage reading above 12 volts with the motor running. Any suggestions?

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Has one of the kids or someone else left on an interior light. Not the main light when you open the door, but and internal map light.

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