Re: 2005 9-3 convertible - Saab 9-3SS Bulletin Board - Saabnet.com
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Re: 2005 9-3 convertible
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Posted by Dana [Email] (#2822) [Profile/Gallery] (more from Dana) on Mon, 26 Feb 2024 02:36:30 Share Post by Email
In Reply to: 2005 9-3 convertible, Matt Hanna, Sun, 21 Jan 2024 09:52:28
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Back to battery drain overnight....
You should attach a multimeter in series with the battery with engine off with 10amp DC current setting.
Amperage should be about ~15 milliamperes or so after 20 minutes of car off, all doors shut, everything off. You can latch the drivers side door by hand to fool the car that the door is closed if needed.

Some of the locations to look at are.....

1. If the amperage is not low like 15 milliamperes DC, (maybe ~2 amps) then pull the infotainment fuse to see if it then drops. The amplifiers of the radio/amplifiers have internal power capacitors which are always powered with the car off. They age after about 15 years and then start to leak current across them.
2. A another possible location is a sticky or worn ISM switch (ignition switch module). When you pull the key out, one of the internal slide switches is not telling the car control modules to go into sleep mode so they are still talking on the communication bus drawing power.
3. make sure the glove compartment and trunk lights are off when shut.

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