Chevy Blazer lights flickering and high pitched whine

lights
batteries
alternators
blazer
#1

Hey all, I have a 2000 Chevy Blazer coupe (not 4x4) that started some issues on my way to work this morning. About 10 minutes into the drive, the instrument panel lights started flickering and I could hear a whine coming from the car that increased/decreased in pitch relative to acceleration/deceleration. Also, my RIGHT blinker “blinks” erratically when used. I did some searches and read that it possibly might be the alternator, but that can’t be b/c last week I got an oil change and had them check out all the fluids, mechanics, and electronics of the car. Everything checked out okay.



Now a few weeks ago I had my car off for a about 3 days and when I got back the battery was dead when I tried to turn it on. After a jump she was good to go. This morning I checked and the battery reads at 14 volts (although it does wobble a bit with the light flickering).



Any help would be much appreciated.

#2

The alternator is the first thing I’d check. Just because it was OK last week doesn’t mean it can’t fail today.

I suggest you have the battery and the charging system tested. Most parts stores will do the testing free.