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Just wired in all my speakers and amp. The only problem i have had is that when i connect the rca cable from head unit to amp for the door speakers, they work fine but when i turn the key i get a funny noise like a high pitched frequency, it goes away but when i start the engine it comes back and stays there. I have disconnected it for now but does anyone know what it could be or had any problems? Cheers Jezza.

hi i had the same problem, i found out its feedback for the alternator, really simple to fix. you need a alternator suppressor. you can pick them up from halfords for £4
http://www.halfords.com/webapp/wcs/stor ... yId_165626
the brown wire is the live and to earth it attach the body to a bolt in the engine bay.
just remember to disconnect the battery first!

i also got one of these but on ebay much cheaper http://www.halfords.com/webapp/wcs/stor ... yId_165626

ill take a photo of it tomorrow.

Cheers mate. That will help me alot. Was hoping someone would get back about this!

Im from Essex to. Where about's you from? Im from Burnham.

im from billericay, near basildon. got a 6n polo in canon red.

so as promised, here's where i put my suppressor
the orange circle is the suppressor just hooked under a nut on the alternator to earth it, and the red circle is the live feed i had to use more cable as what i got was to short.

i also earthed my head unit too, as i was to believe that this could have something to do with it as well. i used to have it going straight to the battery but then read its not a good idea to have a long earth cable, as the more cable there is the further the current has to travel.
this is where i bolted the earth wire to, the hole is already there just behind the passager airbag/glovebox


so thats what i done, i still have a noise but you can only hear it when the volume is turned to zero, buts its quite faint, it doesnt bother me.
anyways heres a few sites that should help anyone else with the same problem

http://www.termpro.com/articles/noise.html
http://www.crutchfield.com/S-L3OMf9lVOC ... groupid=17
this one is ok but dont go on everything it says.http://www.talkaudio.co.uk/vbb/showthread.php?p=1949352

well i hope this helps, let me now