your partly there 'G'
i know which wires to splice in to at the back of the radio, no problem
the sub i fitted to my 1.1, a clarion powered sub, came with information as to which wires went where. there are 2 connectors at the back of the sub, 1 with 2 powers and an earth in a 4 way connector and 1 with 4 wires that go to, im guessing the speakers in a 6 way connector, however i either binned the information or its in my tool box somewhere.
now the 4 way connector with 3 wires is easy to understand, a live, an ignition and an earth. the 6 way connector with 4 wires has 2 gray wires and 2 gray with black tracer.
i may have found where to get the information for the wiring but the sub is in a box in the boot of my car and its cold out...
tweeters have been ordered and should be arriving soon, the parts lad at merc will hand them to his dad as he is our service driver or drop them off as he is passing.