7 Pin 12N Car and Trailer Socket Tester
12N 7 Pin car and trailer tester for testing ISO1724/12N 7 pin circuits
LED indicators show any faults on the towbar or trailer lighting circuits
Requires 1 x 9V PP3 battery (not included) for testing trailer lighting
Not suitable for use with LED trailer lights
Towbar testing requires ignition to be switched on and each function activated in turn
Indicators will show green when function is tested and correctly wired, or red if a fault is present.