alternator whine when i turn my gain up

[henrytad]

hey everyone, i just had phreddy do rca outputs on my holden IQ in my ve commodore, i have run rockford fosgate P400 4 channel amp and a T1500 monoblock amp. if i turn the gain up to about 20% its fine, any higher and i get a ridiculously loud whine. some people have told me its just because the iq unit cant give more power. is this true? or am i doing something wrong. Ive got it powered using thick 0 gauge wiring so ive spent alot of money to try get things perfect. any help appreciated

 

[Wongy295]

Hi there!

I'll ask the obvious question first.

Where have you grounded all of your components? You should be grounding everything to the chassis of the car, NOT to thr battery negative.

 

[acarmody]

Also do the RCA cables run next to the amp power cables.

Also you can give a "Ground Loop Isolator" a try

 

[henrytad]

ive sanded back the bolt where the tail light goes and grounded there with 0 gauge wire and a gold terminal. rcas are no where near power cable. someone mentioned the stereo should be grounded, but how do i do this when its a stock system?

 

[MYVESSV8]

put in a separate ground,

 

[johnni]

put in a separate ground,

How do i ground the headunit ? as im experiencing some whine too ?

 

[MYVESSV8]

mounting screw on side of head unit to metal frame of car

 

[johnni]

mounting screw on side of head unit to metal frame of car

Is that mounting screw on the passenger side or drivers side of the headunit mate ?

ive given it a shot on the weekend and see if it helps