Wesbar 4-Way Flat 25 FT. Trailer End - Wishbone Harness - 3 FT. Ground

The Wesbar 4-Way Flat 25 FT. Trailer End – Wishbone Harness – 3 FT. Ground is the backbone of any reliable trailer electrical system, whether you're towing a utility trailer, boat, or enclosed cargo rig. This connector assembly handles the critical job of transmitting brake, turn signal, and running light signals from your tow vehicle to your trailer without voltage drop or signal loss. Built for durability in harsh roadside environments, the wishbone harness design ensures consistent contact and reduced corrosion exposure—factors that directly impact safety on the highway and compliance with DOT lighting standards.

The 4-way flat connector standard is the industry workhorse for light-duty and medium-duty trailers, accommodating ground, left turn, right turn, and brake/tail light circuits in one compact weatherproof package. The 25-foot harness length provides ample reach from vehicle connector to trailer-mounted junction boxes, while the integrated 3-foot ground wire ensures proper earth reference and eliminates potential grounding faults that cause intermittent lighting issues. The wishbone configuration—with dual connection points at the harness end—distributes mechanical stress and vibration loads more evenly than traditional designs, extending service life and reducing connector fatigue failures common in rough-terrain applications.

This harness works with any standard 4-way flat receptacle on your tow vehicle and pairs seamlessly with matching 4-way flat plugs on trailers and utility carts. Installation requires basic crimping or soldering skills; most DIY mechanics and professional shops complete the job in under 30 minutes. The compact 5 × 3 × 8 inch package ships ready to use, making it ideal for shop inventory, emergency roadside repair kits, or custom trailer builds where OEM harnesses don't meet your length requirements. For anyone upgrading an older trailer's wiring or replacing a damaged harness, this Wesbar assembly delivers the reliability and compatibility needed for safe, code-compliant towing.