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Type | Trailer Connector | ||
---|---|---|---|
Superseded |
ISO 1724 (12N) ISO 3732 (12S) | ||
General specifications | |||
Pins | 13 | ||
Pinout | |||
Pin 1 | Left indicator | ||
Pin 2 | Rear fog lamp | ||
Pin 3 | Ground | ||
Pin 4 | Right indicator | ||
Pin 5 | Right tail lamp | ||
Pin 6 | Brake lamp | ||
Pin 7 | Left tail lamp | ||
Pin 8 | Reverse lamp | ||
Pin 9 | Permanent power | ||
Pin 10 | Switched supply (for fridge) | ||
Pin 11 | Ground for pin 10 | ||
Pin 12 | Trailer Presence Detection | ||
Pin 13 | Ground for pin 9 |
ISO 11446:2004 specifies a 13-pole electrical connector between towing and towed vehicles with 12 volt electrical system. It was developed in 1987 by Erich Jaeger to replace older 7-pin plugs.
Notes
- ^ Pins 3, 11 & 13 must not be joined in the trailer to prevent ground loops
- ^ Pins 5 & 7 must not be joined in the trailer without a pair of diodes
- Pin 12 was assigned prior to 2012; older vehicles could be using this for a different function
References
Sources
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