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This Tooltime 12V 7 Pin Trailer Lights Plug & Socket Wiring Circuit Tester is designed for testing the lighting circuits on both towing vehicles and trailers/caravans etc. The body plugs directly into either 7-pin N-type plugs or sockets and gives a continuity test on all lighting circuits.
Also included in this kit is a pair of adaptors that allow you to also test 13 pin plugs and sockets.
For instructions click here