Charging system computer controlled , do yourself a favor an take it to a qualified repair shop.
SOURCE: check charging system
Do you have gauges on this car also?
If so, you may have a problem with what is called a "current shunt" resistor. This will prevent the car from recharging the battery....accordianman
SOURCE: Charging system
change your battery cables and check all wires on the alternator for loose connections, expecially the grounds.
SOURCE: new battery and alternator. Battery still won't hold charge
Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.
SOURCE: 2003 Ford Focus battery light is on, but alternator appears good
Disconnect battery ground for 30 seconds & reconnect. Light should be out unless you have deeper diagnostic problem. Charging system good Battery good. This action should reset trouble light. Good luck!
SOURCE: ford F150 2002 drains battery overnight, new
Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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