Audio Wiring and foglights - Help Please

[leeroy_25]

I have a couple of problems with sorting my audio wiring out due to a naff adaptor plug I have been supplied. I am trying to re-wire it so it works correctly. I have found a wiring diagram for my audio system but this does not tell you what each colour wire is for. Can anyone help? I need to know which wires on the power plug correspond to what. ie. power, illumination etc.. I can figure power and ignition due to the wire diagram but not the others. Also where is the 10amp inline fuse? is there another fuse box in the car? I think possibly the 10amp one is blown as I have ignition live but no constant. Finally what should the radio relay switch look like? I opened the relay box and in the audio position appears to be just some open wires looping the terminals!? I am sure that cannot be right? Finally for audio does the centre speaker not get used if you put in an aftermarket radio? I spotted a small blackplug wth amp written on it int the hole where ther stereo fits and presume this plugs to the amp which I guess is part of the standard headunit?? (Which I don\'t have!)
Last little problem. I noticed I do not have a fog light?! I presume being an import there should be a seperate wired in foglight? if so I need to sort one out as I cannot find any sign of one which is strange as it has been MOT\'d previously! What is the normal deal with this.. Can I wire into the spotlight/front fog switch on the centre console and put a seperate light by the bumper or into the brake light?

Cheers guys
Lee