7-pin towbar electric socket, supplying power to the trailer or caravan's road lights. In black PVC, corresponds to the black plug on the trailer. Pin numbers correspond to the following functions & wire colour on the 7-core cable
- Left Indicator - Yellow
- Foglight - Blue
- -ve Earth - White
- Right Indicator - Green
- Right Tail Light - Brown
- Stop Lights - Red
- Left Tail Light - Black