Possible grounding issue

[kkkd]

Okay all of my rca cables are away from power cables and my speakers still have a humming noise when the vehicle is running. My deck is in an all metal din installation plate that bolts to the dash and i was wondering if this might be causing the noise?

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[azimuth 5,000+ posts]

i would ground the headunit myself, instead of using the factory harness or ground.

 

[kkkd]

i mean the support i have that the hu slides into is all metal so it grounds with out the harness.

 

[azimuth 5,000+ posts]

i mean the support i have that the hu slides into is all metal so it grounds with out the harness.

what? there has to be a ground wire on the back of the head unit.

 

[kkkd]

There is lol but the head unit slides into a metal plate that is attached to the rest of the frame and dash. So therefor the wire does no good because it is already grounded

 

[azimuth 5,000+ posts]

There is lol but the head unit slides into a metal plate that is attached to the rest of the frame and dash. So therefor the wire does no good because it is already grounded

you have a ground loop. i had this problem, and mine is also encased in metal. grounding the head unit solved my problem.

 

[kkkd]

Where should i ground it to? It just started happening when i hooked my door speakers up to my new amp. I know it isn't the speakers because i can switch rca cables and my rear speakers will do it and the fronts won't. It never happened when i ran 4 preamp channels but now it does with 6 coming out. Idk what to do...

 

[azimuth 5,000+ posts]

Where should i ground it to? It just started happening when i hooked my door speakers up to my new amp. I know it isn't the speakers because i can switch rca cables and my rear speakers will do it and the fronts won't. It never happened when i ran 4 preamp channels but now it does with 6 coming out. Idk what to do...

you are getting a ground loop through the amp. the reason you don't hear it in sub amps, is because the higher frequency is filtered. make sure you have good grounds on the amps and the head unit. grounded to metal, not painted metal. you probably have a ground cluster somewhere. mines on the passenger side under neath the dash. you can ground the head to that, or make your own.

 

[kkkd]

It only whines when the engine is running. I have a separate amp for my subs. The rear speakers were just on a 2 channel amp but when i put the 4 channel amp in the front speaker channels have a whine in them. So should i run the head unit ground directly to the negative on the battery?

 

[kkkd]

Okay guys... I can run one pair of rca's to my amp and then double up my speakers on two channels on the amp there is no noise. But if i hook up the third and fourth channel i hear the noise. If i shut the stereo off and switch the rca's the noise then comes out throught the back... What do you think is wrong?