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
Professional Anti Static ESD Ground Socket L Shaped Socket 2/3/4/5/7 Hole Banana Plug Wireless Wrist Strap Grounding Wire
Aliexpress UK
Connect to the trailer/caravan and press the yellow button to test the trailer / caravan lights. Simple to use, plug into the vehicle and turn the lights on to test the tow bar socket. Will test both the trailer lights and the vehicle socket.
eBay
Tuya WIFI Outdoor Smart Socket EU FR Itlay 16A 4000W IP55 Remote Waterproof Electrical Socket Garden
Aliexpress UK
Justplug the tester in the 7 pin socket or the 7 pin plug of the trailer orcaravan and press the yellow button on the side of the tester. 1 x Plug Socket Diagnostic Tool (As seen in photos). Compact hand held design, portable, easy to carry.
eBay
IP66 Outdoor Waterproof Box Socket EU UK FR US Standard Socket Protective Cover 86/146 Indoor Splash and Dustproof Box With USB
Aliexpress UK
Automotive7Pin to 13Pin Towing Trailer Tow Bar Caravan Light Wiring Circuit Tester Plug Socket UK. 1 Piece Trailer Plug Socket Tester. -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.
eBay
Grounding Plug Anti-static Plug Earthing Socket European US Anti-static Conductive Yarn Braid Earthing Socket
Aliexpress UK
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
Double Plug Protective Contact Extension Cord 2 Schuko Sockets 250 V 16A with 5cm Short Cable 2-Way Outdoor Socket Waterproof
Aliexpress UK
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. This tester indicates quickly if a failure concerns the wiring of the car or the wiring of the trailer.
eBay
German outdoor waterproof socket, 1/3/4 road with covered rain head wireless expansion socket with ground, IP54 16A 3500W
Aliexpress UK
For trailer, caravan wiring to brake/side lights etc. Test operation of vehicle towing electrics and trailer lighting. Automotive, Sport and Leisure Products. Car Accsessories. Get in touch!
eBay
Blue EU Standard Wall Embedded Paint Plastic Power Sockets Electrical Outlets Not Ground Flame Retardant Classic Plugs Socket AC
Aliexpress UK
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. This tester indicates quickly if a failure concerns the wiring of the car or the wiring of the trailer.
eBay
Smart Socket EU Plug Smart Home Outlet Socket Countdown Switch Two Digit Display Timer Time Control Telephone Battery Charging
Aliexpress UK