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Stereo shorted out and now it will not hold a charge changed fuses and checked connections on battery

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If the battery was heated up to to a short it is fried. Batteries do not usually work well after heating caused by excessive load. With the engine running, the voltage should be 14.5V or more at the battery terminals. When off it should be 11.75V to 12.25V if its below 14.5 when running, the alternnator is not charging well enough. If its below 11.5 when static, the battery is not taking a charge properly my guess is that the short overheated the battery and messed up the plates inside it.

Posted on May 26, 2010


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I got zr2 and took dash out to change the air flap acuater and now the altenator won't hold a charge?? Bought new alternator and new battery. Did I miss a plug or wat??????!!!!

You mean alternator will not charge the battery, and the battery won't hold a charge? could be. there are a lot of relays under the dash. many connections some of which may have been disturbed.

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No, the size of the fuse only protects the stereo against a dead short.If your battery goes dead and the connections are all good ,in all probability the problem is in your alternator. A mechanic with a tester can check that out for very little cost.

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First thing I would do is have someone qualified disconnect the alarm and stereo and start over.
Chances are you have circuits cross-connected and something is draining the battery.

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You have a short in the vehicle somewhere that is draining the battery. If you have power seats they are a likely culprite. What you can do if your not experienced at tracing shorts is pull a couple fuses for some of the accessories and charge the battery. If it holds a charge start putting fuses back in until you find the one that kills the battery.

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You have a short at one of your systems. It#s sometimes difficult to find such a "electrical gremlin"... I've searched one week and dismounted the whole interior... try to check some systems for a short as follows: connect a Ampere meter for this checks. First try to remove fuses out of the power distribution center right in engine compartment. Do this step by step, one fuse, if fine, fuse back, next fuse and so on.. if you find the main system with the short, do the same with the fuses in dashboard, passenger side how connected with this main circuit. If you've located the circuit with the short, check the whole wiring system related to this circuit till you get him. ..or.... let a specialist check your car. Good Luck!

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if it dies while it's still running it probably needs a new alternator. you might also remove the radio fuse to see if maby the thief grounded something out.

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Be sure that your stereo is okay. Couple of times the stereo goes bad not that it won't work well but the stereo will be shorting the power on the battery whenever the car is idle.

Good luck.

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Apr 07, 2009 | 1983 Toyota Celica Supra

2 Answers

'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...

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.

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