Trying to install a sony head unit into a 1992 Land Rover Discovery - I have all the wires ready to connect except the Aux wire.

The yellow is the main and it also has an orange companion, which from the factory unit plug are right next to each other, however there is no power feeding through once the key is turned to aux.

I wouldn't imagine this is a fuse as i wouldn't be getting power from anywhere if the fuse was blown.

I have tried all the other misc. wires but to no avail...

Have looked on google for a wiring diagram but can't find anything


Any ideas what I can do to fix this? Any help would be much appreciated