Power wire location on Monsoon head unit...

[Phat3800]

Which wire on the back of this unit is the one for power? I've developed a whistling in my speakers and I'm told that can be alleviated a little with a filter installed on that wire... Also, which wire is the ground and where is it actually grounded at?? Thanks in advance..

[nda0602v6]

The Orange wire will be your Constant (+), the Yellow wire directly next to it will be your Switched (+) and the Black wire is your ground. I don't know where exactly that wire is grounded at but I would try running another ground of your own first before messing around with 'noise filters.' Look for a bolt or screw under the dash somewhere and try that (make sure there is no paint and only bare metal when you ground). There's some nice grounding points located behind either of the kick panels but you'll have to remove them to gain access.