Wiring Diagram

[Targabill]

Hi All, Newbie here:

Can somebody help me figure out where to buy a complete wiring harness schematic, wiring diagram for:

2015 Forester 2.5l schematics..
Vin: JF2 SJADC1 FH512930

Just starting my conversion.. Subaru 2.5 FB25 into a 81 Westy lawn mower...

And yes, I am familiar with the CANbus, and key immobilizer.. I am mostly trying to figure out what I can eliminate from the harness and still run proper.. And how to deal with 2 fuse boxes.

thanks much,
Bill