I posted the thread below in Transporter Forum a couple of days ago but as yet have had no replies, so I'm hoping this this might be a more appropriate area to get some assistance.

Wiring a new radio into a T4

Basically what I'm wanting to know is can I simply replace the existing power wiring from the old radio to the new radio by using the constant/battery (red or pink), accessory/ignition (red/brown) and the ground (orange or black) and ignore all other wires, besides speaker wires, which have their own separate harness.