After eight years, if the battery hasn't been replaced already, then it may be just that. Otherwise the only thing left to check is the battery cables themselves. Corrosion at the battery terminals is obvious but the alternator lead connection to the battery terminal might need to be verified electricaly. Also check the negative battery cable at the block and chassis. Basic charging system test is: Voltage at the positive terminal with ignition and all accessories off should be at least 12.6 volts. If below 12.6 even after 2 hour charge, replace the battery. With engine running at 1500 rpm, between 14.1.and 14.7 volts. With the accessories turned on one at a time, the charging voltage should drop and then come back up and not drop below 14.1 volts. If it does, the regulator is deffective. The voltage should change in response to loads and engine speed. Good luck, Techjoel
Change battery your better could be shorted out
Turn off the engine and place the transmission in park (automatic) or first gear (manual). Engage the parking brake and open the hood. Disconnect the negative cable from the battery terminal using the battery terminal wrench.
Remove the serpentine belt by inserting the end of the serpentine belt tool into the square hole on the belt tensioner and rotating the removal tool clockwise. Unplug the alternator's electrical connector. Remove the bolt holding the positive voltage cable to the alternator using a 3/8-inch ratchet and a metric socket. Remove the positive voltage cable from the alternator.
Remove the alternator bracket bolts using a metric socket connected to a 3/8-inch ratchet. Remove the alternator from the car. Place the new alternator in the mounting brackets and reinstall the mounting bolts using a 3/8-inch ratchet connected to a metric socket.
Reinstall the positive voltage cable on the alternator and tighten the retaining nut using a 3/8-inch ratchet and a metric socket. Plug in the alternator's electrical connector. Compress the serpentine belt tensioner using the serpentine belt tool. Reinstall the serpentine belt according to the belt-routing diagram located under the hood.
Reconnect the negative cable to the battery using the battery terminal wrench. Start the engine and verify that the alternator works.
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