GAAAH! I've bought an Aiwa stereo from Argos and I'm trying to fit it
into a 1994 Rover Metro Tahiti, and I'm having problems with the
wiring.

I've done the speaker ISO connection fine, but the power one has oddly
coloured wires, and I can't work out what they all do?

The new connector has:

black: ground
blue: power antenna
yellow: backup battery
red: power

the Metro one has:

green: ?
black: ?
purple: ?
red/black: ?

I can't work out what needs to line up with what, help! I can't find
an explanation of this on the Net anywhere

Ian.