To do this, you simply have to insert the tester into the socket or plug to be tested, press the test button and a clear diagnosis is made via the LED display. This adapter is a lighting and cable tester for trailers and towing vehicles.
eBay
Test every car every pin socket functions: open the left turn signal, the tester Yellow No. 1 indicator will light up if the LED is not lit, the line connection error or a bad line. This tester has one side to connect the 7-pins plug of a trailer and another side to connect the 7-pins socket of a car.
eBay
7Pin 13Pin Car Towing Trailer Cable Circuit Plug Socket Tester Detector Auto【UK】. - with a 7Pin Connector and a 13Pin Connector. 1 Piece 13Pin Connector. 1 Piece 7Pin Connector. - Trailer tester for 7 pins plug and socket connection.
eBay
Just plug the tester in the 7 pin socket or the 7 pin plug of the trailer or caravan and press the yellow button on the side of the tester. This 7 Pin Tester is designed to indicate a failure in the wiring on both towing vehicles and trailers/caravans etc.
eBay
Just plug the tester in the 7 pin socket or the 7 pin plug of the trailer or caravan and press the yellow button on the side of the tester. Connect the 7-hole plug of the trailer to the tester. This 7 Pin Tester is designed to indicate a failure in the wiring on both towing vehicles and trailers/caravans etc.
eBay
This tester can test the lighting on your car, trailer, caravan etc within second. Plugs in to the socket or plug and press the button.
eBay
This adapter is a lighting and cable tester for trailers and towing vehicles. To do this, you simply have to insert the tester into the socket or plug to be tested, press the test button and a clear diagnosis is made via the LED display.
eBay
Just plug the tester in the 7 pin socket or the 7 pin plug of the trailer or caravan and press the yellow button on the side of the tester. This 7 Pin Tester is designed to indicate a failure in the wiring on both towing vehicles and trailers/caravans etc.
eBay