It is one of 3 things. It is either the battery cables are loose or dirty, the new alternator is not putting out. The alternator gets 12 volts from the ignition to excite the alternator. If you have the 12 volts to the alternator, check voltage at your battery before starting and then start the car and check voltage again. The voltage should go up to 13.8 volts or so. If the voltage is not going up then it is the alternator. If you have the 12 volts to excite the alternator. If you are not getting the 12 volts to excite the alternator then it is either the ignition switch or the Engine Control Module. If you don't have a meter to test voltage, you can take the alternator off and take it to Autozone and they will check it for free.
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The ignition lock cylinder case, including the Passlock?"¢ sensor
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The ignition switch
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The body control module (BCM)
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The security indicator on the instrument cluster
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The powertrain control module (PCM)
Do you know what DTC'S - diagnostic trouble code's are
DTC B2947 DTC B2948 DTC B2957 DTC B2958 DTC B2960 DTC B3031 DTC B3033 DTC P1626 DTC P1630 DTC P1631 DTC P1632
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