Question about 1991 Cadillac DeVille

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The charge light comes on when i turn on the heat and other accessories.like the lights,Radio when driving down the road with no accessories on at all the charge light does not come on at all For 1991 Cadillac DeVille

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Your alternator might be failing. Get your charging system tested, as you can destroy a battery , or you will get stranded if you don't.
Normal battery voltage is 12.5 not running, and 13.5 or so running. If's it's lower running, you are not getting a charge.

Posted on Nov 17, 2009

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Make sure you batt cabes are tight if they are its prob a bad altnator have auto zone test it for free

Posted on Nov 17, 2009

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2 Answers

What is wrong when the battery light comes on while driving?


The battery light comes on when there is an issue with the charging system. Likely your alternator is no longer able to keep up wth the accessories that where on and the charging voltage was dropping to about battery voltage. This is pretty easy to check with a voltmeter. Check voltage at the battery terminals. With the engine off you should see around 12.4 volts. With the ingle running and all the accessories turned on you should see more than 13.5 volts and closer or more than 14 volts would be ideal. If you don't have that than it's probably time for a new alternator.

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Was the battery checked, if not check if for any dead cells., and make sure its taking a charge. A bad or weak belt tensioner may be causing the problem.

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Driving down the road the battery light came on,


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After the light goes out does it come back on while driving down the road?
If it does this sounds as if you may have a heat sensitive problem at the cruise motor. this has a sensoe that turns the light on when it is engaged. when you turn it off and sits a while does the heat under the hood goes higher expanding the circuts an open circut. You may have to replace the board in the motor.

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