Amazon: 4 pin wiring harness wwwon›Search›4 pin wiring harnessAmazon's Choice for 4 pin wiring harness. ONLINE LED STORE 4-Way Flat Wishbone-Style Trailer Wiring Harness Kit [25' Male & 4' Female] [18 AWG Color Coded Wires] [SAE J1128 Rated] with 4 Flat Connector for Under or Over 80" Wide Trailers. by ONLINE LED STORE. 4.6 out of 5 stars 99. 4 Prong Trailer Wiring Harness | etrailer 4-1/2" x 5-3/8" Square trailer tail light is submersible. Integrated LEDs indicate if there's a fault in your trailer wiring trailers more than 80" wide. Includes replaceable Light accepts industry-standard 3-prong plug PL-3 pigtail harness included for trailers that don't have existing plug Surface mount with included studs Designed for trailers more than 80"