I've got exactly the same issue with my X reg 106. I gotta Sony MD head unit and i can't get the 106 to supply power to the memory when the ignition is off. There are 4 wires for power, and according to the Haynes manual they are:
B*** (white) = +ive
M*** (green + yellow) = earth
A*** (blue) = negative
V*** (orange) = lighting feed (the thin wire)
(where V*** is the wire number, if you can read it!)
It works fine with the ignition on, but where can i get a permanent feed for the memory from?
Steve
December 2004