Battery Problems
Thread Starter
1st Gear
Joined: Feb 2010
Posts: 1
Likes: 0
From: Modesto CA
Battery Problems
Just Bought a 07 Let it sit a week Battery went dead.
Replaced the battery.
Let it sit a week new batteryis dead.
With keyless how do make sure everything is off.
Please advise.
Replaced the battery.
Let it sit a week new batteryis dead.
With keyless how do make sure everything is off.
Please advise.
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
The battery is probably bad.
Check the battery voltage after it sits for 24 hours. Remove the negative cable. Take a good digital multimeter and check the voltage of the battery. It should be between 12v and 13v. Reconnect the battery, start the car and it should read ~14v. If less, the alternator needs to be checked.
With the negative terminal disconnected, check for any unusual current draw, by connecting a good digital multimeter to the negative battery terminal and the negative terminal. If it shows more than 250 ma, something is still on and draining it. Look for non-OEM accessories, lights, etc.
Lastly, make sure the top of the battery is clean. A dirty battery can create a short between the terminals in the presents of high humidity. This has happened to me a couple of times. Use a damp cloth with a little bit of baking soda to wipe it off followed by a dry cloth.
Check the battery voltage after it sits for 24 hours. Remove the negative cable. Take a good digital multimeter and check the voltage of the battery. It should be between 12v and 13v. Reconnect the battery, start the car and it should read ~14v. If less, the alternator needs to be checked.
With the negative terminal disconnected, check for any unusual current draw, by connecting a good digital multimeter to the negative battery terminal and the negative terminal. If it shows more than 250 ma, something is still on and draining it. Look for non-OEM accessories, lights, etc.
Lastly, make sure the top of the battery is clean. A dirty battery can create a short between the terminals in the presents of high humidity. This has happened to me a couple of times. Use a damp cloth with a little bit of baking soda to wipe it off followed by a dry cloth.
