Question about 2006 Cadillac DTS

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Would like to know the proper volt readings for 06 DTS

Had battery replaced because the car died sitting in garage. Replaced battery would like to know proper volt readings on computer in car. Mine goes from 12.5 to 14.7

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13.2 volts

Posted on Aug 27, 2009

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Ur battery should be at 12.5 volts and the alternator should carge at 14.5 volts

Posted on Dec 30, 2008

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My Volvo s60 battery died jumped got it started let it run 10 mind tried again now nothing


Sounds like 2 possibilities, A) your alternator is not charging the battery or B) your battery is pooched.

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If it reads 15 volts, your alternator is fine, and your battery is suspect, if it only reads 12 volts when running, then your alternator needs to be replaced.

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Since you replaced both the alternator and the battery, it should be working and the first thing to check is for loose and corroded connections.
In any case, this is what you should do to check the health of your car charging system with the assistance of a good (no need for an expensive unit) digital multimiter:
1) With the car engine not running and ignition off, measure the voltage across the battery: it should read around 12.8 Volts and anything below 10.5 Volts would indicate a faulty battery with possibly one or more shorted cell.
2) With engine running and idling, measure the voltage around the battery terminal: it should read around 13.8 Volts and any thing below 13.5 Volts or much above 13.8 will indicate a faulty alternator OR alterntor regulator.
3) Repeat step two by gently reving the engine: the correct 13.8 Volts should be maintained even with car light on.

Hope it helps: let me know how you go!

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1 Answer

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