Trailer Wiring Harness Installation - 2006 Subaru Outback Mar 19, 2010How to Install a Wiring Harness for a Trailer on a 2006 Subaru Outback Wagon. Today on this 2006 Subaru Outback Wagon we will be installing sequent wiring harness part number 118461. We are in the rear cargo area of the Outback Wagon and we are going to locate the wiring port that our harness is going to plug in to.4.8/5(271)Category: Custom Fit Vehicle WiringBrand: Tekonsha 2006 Subaru Outback Wiring Harness - Main - Subaru Parts Deal SubaruPartsDeal offers the lowest prices for genuine 2006 Subaru Outback parts. Parts like Wiring Harness - Main are shipped directly from authorized Subaru dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options.