Bear - is it the same type of diagram I linked to above, or are they more detailed?

Way more detailed... These are factory engineer schematics.

Thanks, I'm going to give the factory a call to see if I can get them for a 263.

I'll take a copy.

thanks

Half a decade thread bump but was hoping someone had a copy of the diagram, would be great to have!

Also - does anyone know if the factory 6 speaker 226 system is wired to the Sony head unit in series or parallel? Thanks!!

The center cockpit speakers are wired in series with the bow speaker on the same side. The back cockpit speaker are wired individually.