Tip & How-To about 2004 Chrysler Pacifica

My car is draining battery even with ignition and light off

That means that you have a parasitic drain, that can be caused by a short or by a defective device.

First try to understand if there is a parasitic drain.

Once you exclude the drain, replace the battery, a battery with shorted cells can cause the drain.

To measure drainage remove ignition key, connect the amp meter between the battery positive wire connector and positive terminal.A couple of milliamps drainage is normal, and is caused by instruments, car stereo memory, ECU etc.
Start removing more fuses , and open the wiring at different points , trying to locate the problem.
Remove the fuses and see if you have drain by connecting a meter to read amps on battery, if you have drain with no fuse, then the problem is insulated to wiring harness before the fuse, with something shorted between the battery and the fuseblock.
Also check car stereo and car amp HU, the HU can keep a unit on when the ignition key is off, causing drainage.


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Hi.

First ensure that battery is OK. If battery drains while driving, then the problem is related to alternator. Check that there is no problem with dome light or other device staying on because of a shorted switch.

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'04 Chrysler Pacifica battery won't hold a charge for long. Sometimes it will be fine for months and then not start. Other times it won't last more than a day. I was thinking it must be a parasitic drain from somewhere. Does anyone have any idea? I was about to purchase a new battery but don't want to get one if that's not the problem.


First try to understand if there is a parasitic drain.

Once you exclude the drain, replace the battery, a battery with shorted cells can cause the drain.


The firmware has nothing to do with drainage, unless the unit is factory defective.

To measure drainage remove ignition key, connect the amp meter between the battery positive wire connector and positive terminal.A couple of milliamps drainage is normal, and is caused by instruments, car stereo memory, ECU etc.
Start removing more fuses , and open the wiring at different points , trying to locate the problem.
Remove the fuses and see if you have drain by connecting a meter to read amps on battery, if you have drain with no fuse, then the problem is insulated to wiring harness before the fuse, with something shorted between the battery and the fuseblock.
Also check car stereo and car amp HU, the HU can keep a unit on when the ignition key is off, causing drain.


Mar 03, 2009 | 2004 Chrysler Pacifica

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