RE: Radio harness
first of all do you have a multimeter? If not get one, a cheapo digi one will do nicely.
Set it to read 12 Volts and then try connecting across different combinations of wires until you find the supply. Work out which one is the + and which one is the minus. I reckon it should be the single coloured ones, so try them first. Should the radio work off ignition? If so, then there will be two 12V feeds, one permanent live that works all the time and keeps the memory code working and one that comes on with ignition that powers the radio itself.
As to working out which speaker connection goes where, the best way is to get a 1.5V battery, like in your TV remote, and connect it to the speaker wires. when you hear a slight hum/click at the moment of connection, you know you've found a speaker. As to getting them in phase? That's really difficult, but extremely important, out of phase=bad sound. trial and error I guess. HTH
Andy
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