Trailer Wiring Harness Installation - 2014 GMC Terrain Jan 21, 2015How to Install a Trailer Wiring Harness on a 2014 GMC Terrain. Today on this GMC Terrain, we're going to install part number 56094. This is a Curt T-Connector Vehicle Wiring Harness with a four pole flat trailer connect.4.9/5(681)Category: Custom Fit Vehicle WiringBrand: Curt 2014 GMC Terrain Trailer Wiring | etrailer Lowest Price Trailer Wiring Guarantee. Installation instructions and lifetime expert support on all purchases of 2014 GMC Terrain Trailer Wiring. Order online at etrailer or call 800-298-8924.
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