Battery/air bags/charging system

NICHELLE

MEMBER
2006 BUICK TERRAZA
66,574 MILES

Charging system indicator came on. Battery is not keeping a charge. Airbag indicator is on identifying that the airbags are not on. Lights are still coming on in the car when you open the door. Battery will keep a charge for a few hours but not overnight. The battery voltage shows low (12) then goes up to 14.8 when driving it. Do I need a new battery or is this something more? Please help. I don't wnat to get charged for a bunch of stuff I don't need when I take it in for repair. Thanks

1 Reply

CARADIODOC

MECHANIC
33,741 POSTS

Measure the battery voltage with an inexpensive digital voltmeter while the problem is occurring. It must be between 13.75 and 14.75 volts. If it is low, all of the things run by the huge number of unreliable computers will not act normally. Suspect the generator. There is no nice way to say it; GM went from the second best generator to the world's worst pile ever starting with the '87 models, and they have no plans on improving this disaster. It is real common to go through four to six of them in the life of the vehicle. What many professionals have been finding out is to reduce the number of repeat failures you must replace the perfectly good battery at the same time. As they age, they lose their ability to dampen and absorb the huge voltage spikes these generators develop due to their design. Those spikes interfere with sensor signals which makes computers do weird things, and they can destroy the diodes and voltage regulator built into the generator, hence the repeat failures. The old battery may work fine yet in an older car.