I have a 2013 SG and I installed a Sony head unit, Rockford Fosgate amp and kicker tweeter pods with cross overs.
About a month ago I started having issues with my batter light and check engine light coming on, at the same time the voltage gauge would drop to about 10. I replaced the battery and that helped for a bit. It started again recently, if I hut the bike down it usually fixe it for a bit, but it will come back. I don't notice any power difference in the bike, nor is it predictable I.e. when the bike is hot, or longer into a ride.
Well yesterday the opposite happened, my stereo cut off and I noticed the gauged was pinned at 16 volts. I shut the bike off and it was ok for a bit, happened two more times before running for the rest of the trip (about an hour)
Because of the amp, do I need to upgrade stater/regulator?


Any Clue??

 

Replace the Voltage Regulator. Not because of the amp. Your regulator is just not working correctly. Common problem on these bikes. with or without an audio system.