Why would the lights on a 1999 Malibu LS dim and then get bright again repeatedly?

Another possibility is a bad voltage regulator. Monitor the voltage across the battery terminals while the car is running and headlights are on. As long as the engine RPM is steady, the voltage should also be steady. The voltage should be 13.5 to 14 at idle, and 14.5 to 14.8 above 2000 RPM or so. If it's not, the regulator in the alternator may be on its way out.

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Try this: make a ground wire and attach it to bare metal on your firewall and bare metal on the engine block. You may have a ground wire missing or corroded and this may help. Consider that your alternator is attached to a engine that sits on rubber motor mounts and has rubber hoses on it. Your battery is isolated on the frame. This circuit is dependent on good grounds. I hope this helps you. Mark

First answer by 1930fcoupe. Last edit by Werecow. Contributor trust: 80 [recommend contributor]. Question popularity: 20 [recommend question]

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Replace engine in 1999 malibu ls? Why are radio lights on a 1999 malibu going out 1 by 1? You have a 99 Malibu LS and the lights tend to dim and then get bright again dim and get bright again What could be causing this?