Strange Buzzing Noise

[dcs3473]

Getting a very strange buzzing noise coming thru mostly tweets when motor is running and headlights are on. The sound does not increase or decrease with motor rev. Tried everything. New Power to Amps and Head Unit, New Grounds to Amps and Head Unit, New Amps, New Interconnects, New Interconnect Route, New Remote Wire, New Speaker Wire, Constant power instead of Remote Turn Ons, Amp Gains, Ground Loop Isolator, Grounded Head Unit to RCA (Pioneer PRS-80). Everything is gone when system is just on battery power. Please help. Getting very frustrating.

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