Just finding myself int he bowels of absurdity with the wiring in this XT6 project.
Engine, trans and Harness are from the same '01 Outback wagon 2.5.
I pulled the original XT6 wring bulkhead grommet and removed all the Engine, Cruise, Air suspension, and electric steering wiring form it. And then stuffed the few remaining needed wires (wipers) back through the larger of the 2 Outback harness grommets, and fitted it through the firewall. The second smaller grommet of the EJ harness I used a hole saw and punched through were the RHD steering column would go.
When I thinned the harness I left all the ECU, TCU, and Cruise wiring intact (some cruise wires had to be cut to remove and thin) All the ECU/TCU wiring and OBD II, Ig. and fuel relays etc. stayed together. It seemed to have worked well. So far I've only hooked up 2 wires (Batt power to relays, and IG switched power to ECU "on") Turn the key and both relays click, 12v+ present everywhere it's supposed to be at Cruise and TCU as well. relays and ECU/TCU/CCU all have ground from Intake manifold. So far all good signs. But it will be a relief to actually start it and drive. Only about 20~30 more wires to go!