ISO 11446
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[1] to replace older 7-pin plugs.
| 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| Superseded |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 [lower-alpha 1] | ||
| Pin 4 | Right indicator | ||
| Pin 5 | Right tail lamp [lower-alpha 2] | ||
| Pin 6 | Brake lamp | ||
| Pin 7 | Left tail lamp[lower-alpha 2] | ||
| Pin 8 | Reverse lamp | ||
| Pin 9 | Permanent power | ||
| Pin 10 | Switched supply (for fridge) | ||
| Pin 11 | Ground for pin 10 [lower-alpha 1] | ||
| Pin 12 | Trailer Presence Detection[lower-alpha 3] | ||
| Pin 13 | Ground for pin 9 [lower-alpha 1] | ||
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
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