Ok think we are getting closer. I have looked at your photos Rob and I can see that you have laid out the Connect2 system attached to the Alpine ISO leads...I think ?
Not sure in the last photo top right where the big black block is, if that is from the Connects2 system or from the Alpine as I dont seem to have something like that . Anyway maybe showing what I have sitting still in the car may help.
Now I realise that some of it is from the Sony unit so will ignore that .
This is aerial I believe ( when you said blue power lead you meant this ? )
This is USB but obviously I am replacing that with the new unit . My USB-C will go into one of those USB ports to my handsfree holder and the other end will go into the glovebox for USB stick or other use
This is I believe from the amplified Bose ? It was plugged into the Sony in the Sub port even though I dont have a sub ?
This is Mic but I know the Alpine has its onw mic in the pack
Then this lot !! I believe this is from the OEM system . There is blue bullet connection in that loom , see second picture so not sure what that is for
Then this funky gold connector, no clue
This seems to be used but again no idea. It was plugged into the stereo. Tell a lie, could be camera feed when I stick it into reverse ?
and finally this lot. As mentioned I think this is the Sony unit loom so have to unplug.
As you can see not straightforward as I seem to have so many cables ....my head hurts.