2015 Toyota Tundra Trailer Wiring | etrailer Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors with factory 7-Way. Quickly and easily install a 7-way and a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required. 2015 Toyota Tundra Trailer Wire Harness and Connector Equip cars, trucks & SUVs with 2015 Toyota Tundra Trailer Wire Harness and Connector from AutoZone. Get Yours Today! We have the best products at the right price.