| ISO 11446 | |
| Type: | Trailer Connector |
| Superseded: | ISO 1724 (12N) ISO 3732 (12S) |
| Num Pins: | 13 |
| Pin1 Name: | Left indicator |
| Pin2 Name: | Rear fog lamp |
| Pin3 Name: | Ground |
| Pin4 Name: | Right indicator |
| Pin5 Name: | Right tail lamp |
| Pin6 Name: | Brake lamp |
| Pin7 Name: | Left tail lamp |
| Pin8 Name: | Reverse lamp |
| Pin9 Name: | Permanent power |
| Pin10 Name: | Switched supply (for fridge) |
| Pin11 Name: | Ground for pin 10 |
| Pin12 Name: | Trailer Presence Detection |
| Pin13 Name: | 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[1] to replace older 7-pin plugs.