ISO 1724 (7-Pin) vs. US 7-Way RV Blade Socket
Comparing 2 standards across 15 specifications. 15 key differences identified.
The ISO 1724 Connector (commonly known as the European Type 12N 7-Pin plug) is the classical European standard for basic trailer lighting. Featuring a circular 7-pin metal or plastic housing with split brass pins, it provides the essential exterior road lighting circuits (left/right turn, isolated left/right tail lights, brake lights, and rear fog lamp).
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.
Specification Comparison Table
15 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
ISO 1724 / DIN 72577 (Type 12N–Normal) | SAE J2863 / US RV Industry Standard 7-Way Blade |
|
Pin 1 (Yellow–Terminal L)
|
Left Hand Direction Indicator (Turn signal) | — |
|
Pin 2 (Blue–Terminal 54G)
|
Rear Fog Lamp (or +12V permanent feed on older caravans) | — |
|
Pin 3 (White–Terminal 31)
|
Common Chassis Ground Return | — |
|
Pin 4 (Green–Terminal R)
|
Right Hand Direction Indicator | — |
|
Pin 5 (Brown–Terminal 58R)
|
Right Hand Tail Light, Clearance Lights, and License Plate Lamp | — |
|
Pin 6 (Red–Terminal 54)
|
Brake / Stop Lights | — |
|
Pin 7 (Black–Terminal 58L)
|
Left Hand Tail Light and Left Hand Clearance Lights | — |
|
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 |