Question about 1999 Chevrolet Lumina

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I own a 1999 Chevy Lumina. The "VOLTS" light is on, indicating low voltage. I replaced the battery because it was nine years old. I tightened the alternator lugs. The "VOLTS" light is still on. The next thing I need to do is check the voltage output of the alternator. What is the exact output/parameters?

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Charging is 14.3 volts max

Posted on Mar 16, 2011

  • rideredcr250 Dec 08, 2011

    Check for bad ground wire



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My 2000 Chevy Blazer battery light is on. This

Could be anything from corrosion on cables, loose cables, lose or faulty wiring of wires behind alternator
defective voltage regulator. Visually inspect all the items noted. Then use a volt meter and measure the charging voltage of the alternator. It must be between 13,5 to 14.5 volts with and without accessories on at idle and 2000rpm. Anything below 13.5 weak battery or defective alternator ,lose wiring , corrosion. Anything above the 14.5 volts is a defective regulator.

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FROM: LustyKid;

First: How old is your battery--more than 3 years old to 5?. Is it the type where you add water to the cells, Take off caps and see if there is any water in them. If no water add distilled water to each cell up to the split ring. Check to make sure your battery connections are clean and free of corrosion. If all that is within limits then you..........Probably need a new one.

If the battery is OK, have the output voltage check for the alternator. It should be around 13 - 14 volts being put out. If no good replace the alternator. Hope this helps.

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