Question about 2003 Pontiac Bonneville

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Voltage surges on 2003 Bonneville

When I am driving, the voltage meter drops and my lights dim on the car. However, I have had the alternator, battery, and starter tested. The results come back that they are all working properly. What is going on with my car?

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The alternator requires a minimum rpm to produce sufficient current to power everything, When you take your foot off the gas pedal, the engine rpm drops below the minimum required to produce current. This is common in most cars, and not a problem.

If your battery is more than 3 years old, think about replacement within the year

Posted on May 15, 2009

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Its not unusual to have a sudden drop of volts. especially if you have something running like your a/c or heater that requires a lot of power to run. it will also do it when your fan kicks in. anything that requires power is going to kick down your voltage. i would not worry about it unless the battery starts to die overnight.

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