Alternative 1 (recommended)
Replace the trailer's connector and wiring harness with the 13-pin version. Extra power consumers are then connected to pin 9 or pin 10.
IMPORTANT:
If connected to pin 9, the car's battery could be drained if the trailer is connected to the car and the car is not driven.
FAULT SYMPTOM FUNCTION SPECIFICATION
| Pin No. | Function | Max. load |
|---|---|---|
| 1 | Direction indicators L | 6 A (short term) |
| 2 | Rear fog lights 30 A | |
| 3 | Ground | |
| 4 | Direction indicators R | 6 A (short term) |
| 5 | Exterior light R | 6 A (max. nominal load 50 W) |
| 6 | Brake lights | 30 A (short term) |
| 7 | Exterior light L | 6 A (max. nominal load 50 W) |
| 8 | Reversing lights | 25 A |
| 9 | +30 (constant power supply, max. current 20 A) | 20 A |
| 10 | +54 (power supply via car's ignition switch, max. current 30 A) | 30 A |
| 11 | Ground for pin no. 10 | |
| 12 | Not used | |
| 13 | Ground for pin no. 9 |