TOWLINE LIGHT TESTER 7/13 POLE

This tester has a 13-pin socket on each end to be connected to the trailer and car plug. Includes a 13 to 7 pin adapter. 9V battery.
It quickly indicates if there is any damage to the wiring of the car or the trailer.
Also useful for checking caravans and bicycle stands. It has two exits: one for the outlet of the vehicle and another for the intake of the trailer.