Question about 2005 Chrysler 300

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Chrysler 300m electrical issues

2001 300m, new battery 7/08, new starter 3/09, have been towed 4x in the last year, car is DEAD, will not hold a charge, battery cables have been replaced and tightened several!

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  • leelauriel Jul 01, 2009

    the battery was not replace due to this problem, just a new battery, they are going to check it for a bad cell at the shop tomorrow, they keep sayign it is not the alternator because it will hold a charge for several weeks and then die...

  • leelauriel Jul 01, 2009

    thank you



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You have indicated the battery cables have been changed - but what about the alternator??
Your vehicle runs off the alternator - however - if it is not working properly - it is not charging the battery.

With the car off - the voltage should read 8.5VDC to 12VDC.
This is acceptable for starting your vehicle. Anything under 8.5V, and your car will not start.
While running - the battery should measure approximately 14.4VDC - anything under 14, and there is a problem with your alternator.

Have it LOAD tested at your local parts shop. This will tell for certain if the alternator is working properly.

Secondly - if all checks out OK, you may have a voltage gremlin :D
This is some electronic equipment, (relay, broken wire etc).... that is allowing current to go to it while the vehicle is off... and draining your battery. This will take alot of time, however you can pull certain fuses like the radio and defroster to see if the drainage problem subsides... then concentrate on sniffing down that gremlin!

Lastly - if all routes have not come to a conclusion - your BCM or ECM (computer) may be at fault.
If you are driving somewhere from a cold start - and after getting there you are no longer able to start - there may be a cold or cracked solder joint on the main board of the module. In that case replacement is your only option - as it is an enclosed unit, and not separately serviceable.

Was the battery replaced beacuse of this problem? If not - if not - it is not uncommon for new batteries to develop dry cells - rendering the alternator charge useless. You may want to have that LOAD tested at the same time the alternator is done to eliminate that possibility.

Thanks for using FixYa - If you would like further help, please use the "Continue With This Expert" option so we are connected in the future.

Thanks!! :D

Posted on Jul 01, 2009

  • blueextc3221
    blueextc3221 Jul 01, 2009

    then I would suspect an engine computer or faulty relay.

    A relay is an automatic switch that powers on a piece of equipment.

    Power from your battery is constantly fed to it - however it is the relay's job to keep the voltage from getting to the accessory - until it gets a signal to allow it from the ignition.

    This mystery power drain, im afraid, is going to cost you $$.

    If it's not the battery - the cheapest and first thing to do is start swapping/testing relays.

    If no relays are found defective - your next option is the BCM (Body Control Module). This controls just about every function inside the vehicle... from wipers to dome lights etc. It has built in relays that are not serviceable, and the entire module must be replaced.

    Saying that - maybe it would be good to keep a journal of what is happening, and when.... as you may even have a faulty door switch - that only gets tripped once in a while (if it is on another door but the driver's). Make notes of the outside temp, the doors used, and any other thing that may help determine the cause of the unusual drainage.

    My hopes for you is that it is only a bad (dry) cell in the battery causing the intermittant drainage. Only the load test will be able to tell for sure.

    Good Luck!!



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