Ok back up a bit. Im not sure what a crt 700 stereo is, but since i never got any reply from google, i'm assuming its the standard vauxhall head unit. Secondly what wire are you trying to connect to your amp. I suspect its the remote lead. In which case you can 'cheat'. if you connect a distrubution block to your power lead, then plug the positive in as normal. After that run a cable from another output from the distrubution block into your cockpit, attach a switch then run it back through to the amp, and into your remote switch socket. If its the sound ouput, then its beyond my knowlege i'm afraid. I suspect an adapter would go onto your speaker wires and connect to some 'twin phono' leads at the other end. And if its power and earth leasds, buy a kit from halfords thats designed to power an amnp and foloow the appropriate instructions. if you give me some more details i may be able to help more.'
Cheers
Morv
April 2007