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After replacing the alternator with a new one all warning lights still on why ?

(2006 Hyundai Sonata)
in Tuscaloosa, AL on June 20, 2012
I've checked all connections and fuses , thought maybe the computer would have to be reset but I can still disconnect the battery cable and car goes dead , that tells me its still something with the alternator but what ?
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Popular Answer
on June 20, 2012
DON'T disconnect the battery while it's running. that may cause a voltage surge that can damage computers etc. Did you install a factory alternator or aftermarket? did you FULLY charge the battery before starting it with the 'new' alternator.Use a voltmeter while running to test voltage. Use service manual for reference points. If you have access to a scanner with live data , that may be more helpful. many vehicles alternators are controlled by the PCM , the original alternator may not have been the problem.
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