Question about 1998 Cadillac Seville

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How do you test charging system on 1998 cadillac

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You need a volt meter. buy one at harbor freight if you do not have one. usually about $5.00 Set the selector switch on the meter at DC 20V There ae 2 wires/Leads that come off the meter a red one and a black one. Put the black one on the NEG - battery terminal. Put the red lead on the POS + battery post.. with the engine off it should read about 12 volts.. with the engine running it should read 14 Volts or better.. If it does not increase to 14 volts or so the charge is not getting to the battery.. could be as simple as a loose fan belt or a bad alternator, or a short in the wire between the alternator and the battery. let me know what you find..

Posted on May 12, 2014


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Sounds like a faulty voltage regulator to me.Start the car and take a multimeter and check voltage coming out of the alternator it should be 14-14.6 volts if its not within these specs take alternator back and get a new one.

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I have a 1998 Cadillac Deville D Elegance and have had 4 batteries in 5 months. been told it was not the alternator, but a ground? When the first battery died i was jumping it with another car when white...

Instead of guessing as to what the problems is have it diagnosed at a qualified repair shop . Electrical testing needs to be done , charging system out put testing . voltage drop test electrical circuits . A bad ground wouldn't cause the battery to go bad , not charge properly is about all . Was the battery tested before it was replaced ? load and capacity tested ? What's the voltage Measurement at the battery with the engine running ? If the battery failed as many times you said it did , without testing i would suspect a over charge condition .That would be a guess without testing. The charging system on your vehicle is computer controlled .
Battery Common Causes of Malfunction
A battery is not designed to last forever. With proper care, however, the battery will provide years of good service. If the battery tests good but still fails to perform well, the following are some of the more common causes:
• A vehicle accessory was left on overnight.
• The driving speeds have been slow with frequent stops (stop-and-go driving).
• The electrical load has exceeded the generator output (particularly with the addition of aftermarket equipment).
• Existing conditions in the charging system, including the following possibilities:
- An electrical short
- A slipping belt
- A bad generator
- A bad generator voltage regulator.
• The battery has not been properly maintained, including the following situations:
- A failure to keep the terminals tight
- A failure to keep the terminals clean
- A loose battery hold down.
• There are mechanical conditions in the electrical system, such as a short or a pinched wire, attributing to power failure.

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1 Answer

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Apr 05, 2009 | 1998 Cadillac DeVille

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