99graytahoe
TYF Newbie
I have a 99 tahoe. yesterday on the way home, i noticed that my voltage gauge was moving back and forth and then noticed the battery light started to flash while sitting at the light. once i started going again, the battery light went away and the voltage gauge moved back over 14. i got home and put a volt meter on the battery and it read 14.26 and would drop to 13.89 and then back up to 14.12. it would keep doing this. you could see the light under the hood start to dim down when the voltage drops. my question is it the alternator or the battery that is going bad.