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Then the alternator needs to be looked at asap But I even took the cable off alternator and car stayed on which meet alternator in good right?

Edit: If you took the cable off the alternator, then you disconnected the alternator so you didn't test the alternator at all. As a quick test only, removing the positive battery cable at the battery and the engine stays running means the alternator is charging. Do not run the engine more than a few seconds like this, and even then a voltage spike can wipe out your car's electronics. Much better to get a charging system tester to check things or at least borrow a voltmeter.

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Q: Brand new car battery battery light still on why?
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