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2009 impala ltz battery draining while parked
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m.williams43
New User
Jul 25, 2013, 11:15 AM
Post #1 of 6
(5409 views)
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2009 impala ltz battery draining while parked
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2009 Chevy Impala LTZ 3.9 V-6 with 64,000 miles. also, I just purchased a new battery 3 months ago. had the starter, alternator, and battery checked and they all came back good after the 1,000 mile drive back home from Florida. While we were there the car sat a few days and it was completely dead, no light left on or anything plugged in. jumped it and a couple days later completely dead again. We did have new tires put on right before we left and I believe they ruined the TPMS sensors even though tires plus denies it. they worked fine until they put on new tires. would the tpms sensors be looking for a signal and that's why the battery is draining? any advice would help, thank u
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 25, 2013, 12:07 PM
Post #2 of 6
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Re: 2009 impala ltz battery draining while parked
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No, that's not your battery drain problem. You need to start out by testing the battery and charging system.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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m.williams43
New User
Jul 25, 2013, 12:11 PM
Post #3 of 6
(5394 views)
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Re: 2009 impala ltz battery draining while parked
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Had the starter, battery, and alternator all checked, autozone says they all passed and are working good. am I forgetting something else?
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Hammer Time
Ultimate Carjunky
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Jul 25, 2013, 12:15 PM
Post #4 of 6
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Re: 2009 impala ltz battery draining while parked
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Then you need to test for a parasitic draw.
There is a procedure for finding a battery draw like that.
You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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m.williams43
New User
Jul 25, 2013, 4:20 PM
Post #5 of 6
(5373 views)
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Re: 2009 impala ltz battery draining while parked
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thanks for the info. i'll give it a shot. I have to purchase a digital ammeter since I do not own one of these, where is a good place to buy this and how much?
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Hammer Time
Ultimate Carjunky
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Jul 25, 2013, 4:30 PM
Post #6 of 6
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Re: 2009 impala ltz battery draining while parked
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A real high grade one is a couple hundred but you can get much cheaper ones online or at a parts store like Autozone. They have some down in the $30-$40 range.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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