This is what I have planned once I've upgraded my front speakers which are currently sat in a box waiting to be fitted , my question is do the speaker wires run from the doors to the rear and all the splitting and crossovers from factory are in the rear so I can just find the appropriate wires and connected direct to amps.[/QUOTE]
I believe the crossover is done by the amp as I didn’t find any crossover boxes in my doors. You can definitely split the wires out of the connector, identify the various speaker wires, and hook the straight into a new amp. Identifying which wires go to which door/component can be confusing because the wires change colors somewhere in route to each location. Bentley gets you 90% of the way, and then I recommend using a AA battery at the amp end of the wires to check both the connection and polarity is correct at the speaker end. Label each one as you break them out of the plug.
https://m.youtube.com/watch?v=pmU-Ky...F0dGVyeQ%3D%3D