1998 Chevy Suburban alternator is overcharging

1998 CHEVROLET SUBURBAN

11,500 MILES • V8 • 2WD • AUTOMATIC

MIKE LOFGREN

MEMBER
1 POST

Hi,

I am thinking of buying a 1998 Suburban. When the car is running off of idle, the battery light blinks continuously in a steady rhythm. 5.7 liter gas engine, two wheel drive, automatic transmission.

The voltage gauge on the dash shows about 16 volts when driving.

What causes this and will it have likely done major damage to the car's electrical system?

Also, the airbag light next to the battery light comes on and off intermittently. Would this be related to the overcharging or does it mean the airbag is damaged or has been deployed at some time or other?

Thanks,

Mike

Jan 13, 2010 at 8:45 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,244 POSTS

Mike:
Honestly, the most likely cause of an over charge is a bad regulator which is part of the alternator. Yes it can cause damage even a fire, but if everything is still working, chances are it will be fine if repaired.

As far as the Air Bag light, I would have to say have the computer scanned to determine what is causing that to come on. It could be a sensor that is bad or has a bad connection.

Ask the person who is selling the vehicle if you can have it checked. If they allow, take it to a nationally recognized parts store and have them check both the alternator and scan the computer for codes. Most will do it for free, so there will be no money out of pocket for you.

Let me know if you have other questions and thanks for using 2carpros.com.

Joe

Jan 13, 2010 at 12:34 PM

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