Wesbar 66 Trunk - Trailer Connector Kit Wesbar harnesses conform to all applicable SAE, NMMA, and TMA standards to provide years of dependable service. Standard 4-way harnesses have an 18 ground wire except where noted. Wesbars 5-way plugs mate with all Wesbar 4-way plugs and will operate all DOT required lights. 4-Flat Trailer End Connector 18 Wishbone Harness 18 Ground w 4 Car End 18 Ground California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Prod