How NOT to install a trailer harness on a Subaru Outback Click to view on Bing5:46Recently, we were called out to upgrade a customer's 4-way trailer wiring harness to a 7-way round plug. While examining the existing wiring harness that was installed by a "competitor," IAuthor: Long’s Northwest Hitch, Inc.Views: 17K Installation of a Trailer Wiring Harness on a 2015 Subaru Click to view7:19Today on our 2015 Subaru Forester, we're going to install part number C56040. This is a Curt T-Connector Vehicle Wiring Harness with a 4-Pole Flat Trailer Connector.Author: etrailerViews: 29K Subaru Forester Trailer Wiring | etrailer Guaranteed fit Subaru Forester Trailer Wiring. Lowest price guaranteed. Thousands of customer trailer wiring reviews, expert tips and recommendation. Lowest price guaranteed, easy online ordering at etrailer or call 800-298-8924. 2016 Subaru Outback Hitch Wiring | Harnesses, Adapters Subaru Outback 2016, Towing Wiring Harness by Westin®. Location: C. Electric System Type: 3-Wire System. This superior product is perfect to make your trailer towing experience safe and convenient. Designed to meet the highest quality..