Hi guys I'm getting really bad alternator whine from my car it blimming annoying!!!!
It only does it when car is in ignition slightly then when car is on a lot also when I open the door it beeps!!!

So far I have tried grounding the amp in different place
Separate my rcas from power cable
Tried grounding my head unit to battery
Replaced new amp just bought about 30 mins ago
Changed rcas bought 30 mins ago

And that's all I could think of please has anyone got any other suggestions this is driving meeee maaaddddd!!!

Thanks

Nick

I started a similar thread on this recently, in the end I threw out one the old front amp and rewired the front speakers to come directly from the head unit, the sub amp is still OK and is fed via the RCA outputs. I tried different earths, re-routing the RCA cable, etc., and in the end just cut out the amp that was picking up the interference. The interferences was not there before with the old head unit but I couldn't test with that since that seemed to have stopped workiing completely.

So as a final suggestion, try without the amp, and with another head unit just to see if those make a difference?

Have you tried a ground loop isolator? halfords GLI

My next step will be using group loop isolators on all three rcas and 12dc power noise filer. I'm sure I'm not the only one with this problem so will keep updated. not willing to run speakers off head unit and do away with amp i like the crisp quality I get from amping my speakers thanks for the advice daveG and james

Nick