ISO 11446 (13-Pin) vs. US 4-Pin Flat Connector
Comparing 2 standards across 13 specifications. 13 key differences identified.
The ISO 11446 Connector (also known as the Jaeger 13-Pin European standard) is the modern mandatory trailer electrical interface across Europe, the UK, and Australia. Featuring an IP-sealed, waterproof bayonet twist-locking circular housing with 13 gold-plated pin contacts supporting individual left/right lighting circuits, rear fog lamps, reverse lights, and continuous/switched caravan power.
The US 4-Pin Flat Connector (standardized under SAE J1239) is the ubiquitous North American electrical plug for light-duty utility trailers, small boat trailers, and snowmobile haulers without electric brakes. Utilizing an inline rubber molded connector with one exposed male pin and three shrouded female sockets.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
ISO 11446-1 / DIN ISO 11446 (Jaeger 13-Pole System) | SAE J1239 / 4-Pole Flat Connector |
|
Mechanical Bayonet Lock
|
90-degree twist-to-lock bayonet collar with double silicone perimeter gasket (fully waterproof IP67) | — |
|
Pin 1 & 4 (Indicators)
|
Pin 1: Left Indicator (Yellow) | Pin 4: Right Indicator (Green) | — |
|
Pin 2 & 8 (Fog & Reverse)
|
Pin 2: Rear Fog Lamp (Blue) | Pin 8: Reversing Lights (Pink) | — |
|
Pin 3, 11, 13 (Independent Grounds)
|
Pin 3: Ground for Pins 1-8 | Pin 11: Ground for Pin 10 | Pin 13: Ground for Pin 9 (isolated 2.5 mm² ground returns) | — |
|
Pin 5 & 7 (Isolated Left/Right Tail)
|
Pin 5: Right Side Marker/Tail (Brown) | Pin 7: Left Side Marker/Tail (Black — separate fuses prevent total blackout if one side fails) | — |
|
Pin 9 & 10 (Caravan Power)
|
Pin 9: Permanent +12V unswitched battery feed (Orange) | Pin 10: Switched ignition +12V for caravan 3-way absorption refrigerator (Grey) | — |
|
Pin 1 (White–Exposed Male Pin)
|
— | Ground / Earth Return (Exposed male pin ensures ground connects first upon insertion) |
|
Pin 2 (Brown–Shrouded Female)
|
— | Tail Lights, License Plate Lamp, and Side Marker Running Lights |
|
Pin 3 (Yellow–Shrouded Female)
|
— | Left Turn Signal and Left Stop/Brake Light |
|
Pin 4 (Green–Shrouded Female)
|
— | Right Turn Signal and Right Stop/Brake Light |
|
Combined Stop/Turn Architecture
|
— | Brake and turn signals share the same wire and bulb filament (flashing one filament while braking) |
|
5-Pin Flat Extension
|
— | Adds a 5th Blue wire for Reverse Lights / Surge Brake Hydraulic Lockout Solenoid (boat trailers) |