7-Way Flat Pin to 4 & 5- Flat Adapter w/LED Circu

The REESE 7-Way Flat Pin to 4 & 5-Flat Adapter with LED Circuit (Model 78118) is a heavy-duty trailer plug adapter engineered to bridge legacy and modern electrical connectors on towing vehicles. This adapter converts a standard 7-way round pin connector to both 4-way and 5-way flat connectors, making it essential for operators managing mixed trailer fleets, RV recovery operations, and off-road towing scenarios where connector compatibility cannot be assumed.

Built with durable plastic construction and finished in tactical black, the adapter measures 3.55 x 2.3 x 12 inches and weighs only 0.32 lbs for minimal cargo impact. The integrated LED circuit enables visual verification of power flow between connectors, critical for field diagnostics when electrical faults could compromise towing safety or mission equipment transport. The 7-way input accommodates the full pin configuration (brake, running, left turn, right turn, ground, reverse, auxiliary), allowing the adapter to support all standard trailer lighting functions regardless of which flat connector type the towed vehicle requires.

This adapter addresses a common field problem: when a backup trailer or borrowed equipment arrives with a non-native connector type, traditional workarounds require splicing or purchasing an entirely new trailer harness. The dual-output design (4 & 5-flat capability) eliminates that downtime. Users deploying multiple trailers across different platforms—whether supporting logistics operations, search and rescue, or off-grid expeditions—find this adapter indispensable for quick connector transitions without breaking the main towing circuit.

Towing professionals rely on REESE products for consistent performance under load and environmental stress. The plastic housing resists corrosion in wet conditions better than bare metal alternatives, while the integrated LED provides immediate feedback that electrical continuity is maintained—a feature that saves troubleshooting time on remote deployments where towing failure directly impacts mission success.