ramjet1121

Thank you everyone for enlightening me on how the RVC system works. I have a 2006 GMC Sierra whose alternator Ive been worrying about. My concern started when I noticed my headlights and dash lights flickering. I watched the voltmeter and noticed some fluctuations also. I assumed the two issues were connected. Maybe they are and maybe they aren't. I recently purchased and installed a digital voltmeter/USB phone charger that plugs into the lighter socket. I've observed the voltage fluctuation that you all have described as normal - sometimes indication only 12.8 volts. That really concerned me until I was enlightened about how the system works. The only issue I'm concerned about with the alternator is that I have observed voltage readings as high as 15.2 volts. That is too high, especially since the battery is basically fully charged. With all that being said, I'm still concerned about the flickering lights. I've read a lot about bad grounds, etc, but now I'm thoroughly confused. Any suggestions would be appreciated.