Question about 1991 Cadillac DeVille

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Service charging system soon

I have a 97 caddy and i just replaced the battery and alternator. now the service charging system keeps flashing across my info display screen. what else could it be?

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Could just need a simple reset of the computer. You may have to have a mechanic hook up a computer under the dash to do this.

Usually you can just disconnect the negative battery cable for 10 mintues or so and it will clear the code out.

Posted on Dec 18, 2008

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There are three main possibilities:
One is that your battery might not be making a good connection somewhere, like a bad ground or corrosion at one the cable ends, positive or negative. A bad connection will prevent the battery from ever charging fully.
Also make sure no connections are loose.

Another possibility is that you may have a light or other accessory stuck "on" after you leave the car, like a trunk light, etc.

The third possibility is that there is a short somewhere in the electrical system, in the form of a bare wire or malfunction of some accessory which is draining the battery. Sometimes this can be very difficult or time consuming for us non-mechanics to figure out.

If you still have trouble after the battery and connections check out okay, it's probably a good idea to have a mechanic isolate the problem.
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You may want to check the output of the alternator with a voltage meter. While running, the voltage at the battery should be about 13 -14.7 volts. While the car is off, the battery should be about 12.6 volts but no lower than 12. This may vary a little with the outdoor temperature.
Make sure the water level in the battery is correct -- always use protective eye wear and use extreme caution any time you work around a battery.
A good local mechanic won't charge much to do a basic check up of your charging system and this might be well worth it. He can also verify in fact if the battery is being discharged and how much.
If there is a short somewhere, he is probably your best choice for diagnosing and fixing that.

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