UK-POLOS.NET - THE VW Polo Forum

Hi, I am wiring in an 2din sony stereo to replace the rcd200 unit. Looking at the polo harness connector pin 13 has a black brown or possibly black red wire, does anyone know what this wire is for. I suspect it may be an ignition 12v from fuse 10, could I use it for the switch live for the new radio if that's the case although its quite a thin wire?

Thanks
Victor