Question about Cadillac DeVille

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I have a 1994 cadillac sedan deville with a 4.9 engine. The message center in the instrument cluster says the voltage is too high. I have replaced the alternator but still comes on . Maybe you can help me. Thank You.

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The first thing to do is have the battery tested and then the charging system checked, this will show you if its overcharging,if it is overcharging then take a look at the wiring going to alternator,and also a bad battery can also cause a problem so first find out if message center is displaying the correct message, this will show if center is okay then move on to battery testing then alternator test, there may be a problem with the wiring or a defective alternator.

Posted on Aug 07, 2010

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