Hi guys, I have a 95 Defender 110 and am wanting to replace the original radio. My problem is finding out with absolute certainty what the existing wire colours mean. I know which are the speaker wires so no problems with that but there are four extras.
They are red, pink, black & grey.

From what I've found so far, they are:
red either accessory or positive feed from battery
pink either accessory or positive feed from battery
black ground (seems to be universal agreement on that one)
grey illumination - apparently or could be either accessory or positive feed from battery

From pictures I've seen and sites I've visited I can't find an authoritative statement to state each wires purpose.
I tried using a multimeter but I think I broke it.
Thanks in advance for any advice.
cheers Gerald