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Message: <blockquote data-quote="hispls" data-source="post: 8832740" data-attributes="member: 614752">The only sure "fix" I can think of is to add a second alternator and battery for just your audio/accessories.   I too believe this variation you see is by design of your vehicle. It is possible that just buying an internally regulated aftermarket alternator or otherwise bypassing the ECU to externally regulate your alternator will sort you out but I wouldn't begin to try to guess if your ECU might get angry if it keeps telling the car to charge at one voltage but keeps reading something different.IMO your best bet is to just buy amplifier(s) that are known to function without issue within the 13.0 to 15.2V range.  If you leave a couple hundred watts on the table for not having 15V all the time it will likely be inaudible and I don't believe any modern amplifier is going to give you trouble, fail, or protect if you can keep it above 12V and below 15.5V.  There's some that can get into trouble above 15.0V but only in extreme (competition type) applications.  I don't believe you're going to have any issues for just a normal system that you use for playing music.</blockquote>