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2001 jaguar s-type when I turn off car, battery would completely die.. Checked alternator, that was good. mechanic Suggested take to dealership and reset computer/electrical system! Anyone!!?
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Do you go long periods of time without cranking or driving your car. If you go a week or more without running the car it can run a battery down, maybe two weeks for some cars. My daughter 08 impala will run down after 7 or 8 days so I pull the negative cable off the battery. Some cars will have radio problems if battery is disconnected that may be why they want it on a charger. The fact you drove to dealership before it died would seem to me to be a alternator problem. Did the dealership actually test for voltage at battery and alternator voltage to battery. Most cars I have had the battery will run about 12.7 or above voltage when off. While running it usually runs over 14 to 15.5 at battery, depending on vehicle if the alternator is charging.
First place I would look is the boot light . Is the switch properly adjusted to switch off the light when the boot is closed.. Remove the eart lead and put an ampmeter in the line and read the current draw . It will give some idea as to what may be still on
have you checked the alternator. so when you put in the new battery you get nothing . thar is the alternator. my link to my garage https://www.facebook.com/TedsRepairs
SOUND LIKE ALTERNATOR FAULTY, BUT FIRST CHECK FOR LOOSE OR SLIPPING DRIVE BELT. CHECK ALTERNATOR FUSE. CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES MAKE SURE NONE OF THE WIRES IS LOOSE, DISCONNECTED OR DAMAGED.
have the alternator bench tested for faulty rectifier diode pack
it may be charging the correct voltage but it is AC voltage and not DC voltage
in which case the battery will die quickly
next to check is the voltage regulator
it has to be 4.5-14.8 volts DC and if it in the ECM unit , will require a new ECM to fix
it seems like something is draining your battery while the car sits overnight. causing the battery to get weaker and weaker putting stress on the alternator making it fail prematurely. the dealership will do a paracidic drain test where they'll find out what is draining your battery while your car sits overnight. it could be a bad module somewhere that's staying on when it shouldn't be.
Check the battery cables at both ends. There's a good chance there's corrosion preventing the charge from the alternator from charging the battery. If the cables are fine then check the connection at both the solenoid and the alternator and make sure they are clean and grounded.
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