alternator noise please help

i have some terrible engine noise heres what i have checked so far power and rca are on opposite sides of car ground for amps is to bare metal (tried many locations already) headunit is grounded to bare metal tried a different set of rca cables from the deck to amp tried running ground straight from bat to an entirly diff amp im tired of messing with anyone have any ideas the only thing i can think of is its the deck (pioneer 6400cd indash widescreen)

you could try installing a ground loop isolator. they should be under $15.Sound Pressure

You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!

oh yeah i forgot i have two amps and have a ground loop isolator on each amp but the damn noise was so loud before i can still hear it with the filters

Lower your gains on each amp and see if this helps.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Also, how old is the car?  It could be bad spark plug wires or a cracked distributor cap.  And, check the ground for your radio antenna.

oh yeah i already tried messing with the gains did not do a thing for me and the car is an 02 civic si

make sure your radio ground is connected to chassis metal,make sure your amp ground is short and the proper guage for your amp. Also did youy use the rcas with a wire for your remote lead if so dont use that wire and run your own remote wire from the amp to the radio.Is your rcas close to other power wires even if they are not amp power wires?,if so move them away from any other power wires.Did you ground your radio with factory grounds,if so move them to there own ground directly to chassis metal not secondary metal that is on the dashboard.Is your amp connected to a secondary piece of metal like one that is on the whell well,if so change it and put it directly on chassis,ALSO SOMETIMES PEOPLE WHO HAVE GROUNDED THERE AMPS TO SEAT BOLTS HAVE THIS PROBLEM .GOOD LUCK