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Take the negative cable off and put a test light between the cable end and the battery post. If the light lights you have something staying on in the car draining the battery. Then you have to use the process of elimination to find the problem. Could be dome light, glove box light or anything electrical. You can get a start on finding the problem by pulling one fuse at a time and rechecking. If a fuse causes the light not to light than that cicuit is the problem. This can be a long process so just take your time and stay calm. Good luck.
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What's the voltage at the battery with the car running ? Testing an not guessing is the way to do proper diagnostic's ! Battery light staying on , is there B+ voltage at the alternator connection's ? A new alternator won't make a bit of difference if no power to the alternator . Looking at a wiring diagram an testing the electrical circuit ,doing voltage drop testing , plus checking for DTC'S - diagnostic trouble code's . Some vehicle's charging systems are computer controlled . And looking at a wiring diagram i see your vehicles charging system is computer controlled . If you have done so already , take it to the dealer
This is easy to test but you need a multimeter. Connect the multimeter to the battery and run the engine at a fast idle (say 2000 rpm). You should get a voltage reading anywhere from 14 to 15 volts if the battery is fully charged and the alternator is working. If the reading is around 12 volts, then the alternator is not working.
REPLACE POSITIVE BATTERY CABLE.CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR VOLTAGE REGULATOR WIRES FOR DAMAGE.HOOK VOLT METER TO BATTERY FEED WIRE MAKE SURE 12 VOLTS GETTING TO ALTERNATOR FEED WIRE TO ALTERNATOR POSITIVE HOOK UP IF NOT YOU HAVE BLOWED FUSE TO WIRE FEEDING ALTERNATOR COULD HAVE FAULTY BATTERY POSITIVE CABLE OR CABLES CORRODED NEED CLEANING.
Get a volt meter and check alternator voltage at battery while engine running, should have no less then 13.5 volts, if you have good voltage at battery, disconnect battery terminal neg. hook test light at cable (neg) and at battery, make sure every thing is off and door's are close if test light lights up you have a battery draw you'll need to fine short.
1st check and make sure you have a good ground on the battery. Check the battery. Make sure it passes a load test. It is possible that the battery is not holding a charge. Make sure all alternator connections are connected.
Alternator may test fine on bench, but not in car. Your PCM may also not be switching the alternator correctly. Test for how may volts you are getting at the battery, if it is battery voltage, or a little above, you most likely need an alternator.
its the battery. the battery holds the charge and the alternator charges it so when you jump the car it stays running because you alternator is providing power when you shut the car off you have a bad battery that isnt holding the charge needed to start it again.
alternator does not hold a charge it simply charges the battery by unhooking the battery you are taking all voltage from computer and car will not run the proper way to test your alternator is use a multimeter and check voltage at battery while car is running if you have 13-14 volts it should be fine.
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