One person can test the 7 pin socket from the drivers seat with the Towing Socket Tester.
Checks brake lights, tail lights, indicators, hazards and fog lights on 12 volt systems. So fast and simple.
6 LED display to test tail lamp, stop lamp and fog lamp circuits from driver’s seat
Supplied with 5 metres of 7-core cable and 12 Volt 7-pin N type plug