With this Carpoint LED tow bar socket tester the wiring and connections of a 12 Volt socket can be tested and checked for correct functioning. With the double plug on the tester, both 7- and 13-pole sockets can be tested. The testbox is also suitable for cars with a Canbus connection. 

The cable has a length of about 3.5 meters so you can test from the driver's seat. Test each circuit one by one from the vehicle using the buttons and levers in the car. The LED indicator lights up when the circuit is working properly.