Curt Trailer Connector Adapter with Backup Alarm - 4-Way to Black wire is for 12 volt power; White wire is ground; 4-Way connector plugs into vehicle 4-way connector; 57102 Curt Multi-Function Socket with Back Up Alarm - 7-Way RV Blade and 4-Way Flat - Universal Fit Installation Details . Use the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package, # C68JR to quickly and easily install a MATE-N-LOK Connectors: Universal MATE-N-LOK | TE Connectivity TE's MATE-N-LOK connector line includes Universal MATE-N-LOK connectors with a combination of pins and sockets intermixed in the plug and cap housings to achieve excellent electrical performance. 12, 15 matrix; Wire-to-wire (1-15 positions) Wire-to-board (2-15 positions) Universal MATE-N-LOK printed circuit board headers. Product