Alternator whine BMW

[Karuza]

Everything worked fine until I connected a second amp and some subs. I had a loud thumping noise from inside speakers so I immediately disconnected everything and reverted it back to previous setup. The setup before worked fine but now it gets alternator whine and some static when the car running.

The whine only happens in my door speakers meanwhile all the other speakers work fine.

I hooked up some RCA cables to the amp, but they weren't connected to any head units, and the whine went away. The RCA cables run down the middle of the car to the trunk, and the power wires run down passenger side to the trunk battery which is also on passenger side.

The amp's gnd goes to negative terminal on the battery.

Also, before this happened I had pulled my door panels off to replace the clips but nothing on the speakers were disconnected.

Help?

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[loudaccent 10+ year member]

1. rca to close to power wire

2. pinched the rca cables to metal

3. ****ed the head unit up, if pluging and unpluging rca from head unit with out it being off.

4, just bad rca's

 

[Stephen_c 10+ year member]

my rcas are ran in the same bundle as my 2 runs of 1/0 and i dont have noise. I did have noise because my power wire was so close to my crossovers and the inductors were picking up the "noise"

 

[Karuza]

I unplugged the RCA from the amp directly and not the head unit.. could that still cause a problem? The head unit wouldn't adjust bass and treble until i disconnected the battery and reset it.

 

[Karuza]

Also, when I'm screwing down the screw in the A+ wire spot and if the screwdriver accidentally touches the amp, sparks fly.

 

[denali804 10+ year member]

Is it a pioneer(sp?) head unit.

 

[Karuza]

Alpine CDA-7894

Elemental Designs Nine.2 Amplifier