Would love a little guidance!

Thomas R

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Hey!
I have posted a few times and have read many threads but am struggling to find any information on what I actually require.
I am looking into Converting my single din concert head unit into a RNS-E. I understand the whole VAGCOM programming and also how to cut down the climate control and to insert a double din cage however I am really struggling to understand the wiring.
I have a harness which was given by a friend and was assured that this would enable it to work with the BOSE sound system.

I am struggling to make any sense of the wiring what so ever. I currently have 3 connector blocks plugged into my head unit but the new harness has 4 slots. I have checked and 2 of them connect and line up perfectly but the other two make no sense what so ever, it appears that even the pins don't line up.

This may be something very simple I am missing but I would be extremely grateful if someone could shed some light on this situation so I can go ahead with the install.
 

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