US 7-Way RV Blade Socket
Towing & Hitches · 8 specs
Direct Answer
The US 7-Way RV Blade Connector (standardized under SAE J2863) is the primary heavy trailer electrical interface in North America. Encased in a rugged round socket with a spring-loaded weather flap, it provides 7 flat brass blade terminals powering tail lights, turn signals, reverse backup lights, 12V auxiliary battery charging, and proportional electric trailer brakes.
Source: SAE International Standard J2863 (Automotive Trailer Tow 7-Pin Electrical Connector) · Last reviewed Aug 28, 2026
Specs
| Standardization | SAE J2863 / US RV Industry Standard 7-Way Blade |
| Pin 1 (White / Center bottom) | Chassis Ground (Heavy 10 AWG wire for high-current electric brake return) |
| Pin 2 (Blue / Center left) | Electric Trailer Brakes (+12V modulated PWM signal from in-cab brake controller) |
| Pin 3 (Green / Top right) | Tail Lights, License Plate & Running Clearance Markers |
| Pin 4 (Black / Top left) | +12V Auxiliary Battery Charging Power (30A fused feed to charge RV house batteries while driving) |
| Pin 5 (Red / Bottom left) | Left Turn Signal & Left Brake Light |
| Pin 6 (Brown / Bottom right) | Right Turn Signal & Right Brake Light |
| Pin 7 (Yellow / Center pin) | Reverse / Backup Lights & Electric Reverse Lockout Solenoid for boat surge brakes |
Proportional Electric Trailer Brake Control
The Blue wire (Pin 2) carries high-current DC pulses commanded by the vehicle's electronic brake controller. An internal inertial accelerometer senses vehicle deceleration force and modulates current (1 to 12A) to the trailer's electromagnetic drum brake magnets, ensuring the trailer brakes in perfect synchrony with the tow vehicle.