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
Trailer Plug Holder 7 Pin /13 Pin Trailer Connector Trailer Parts Mounting on Trailer Drawbar
Aliexpress UK
This tester is for a trailer/caravan and tow bar socket/plug checker. 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
12V 7-Prongs Trailer Test Plug Adapter Trailer Tester Trailer Socket Plug or RV Trail Truck
Aliexpress UK
13 Pin towbar socket tester is perfect for checking all electrical circuits are working correctly after installation and before towing. Note – circuits 8, 9 & 10 may not be present in all 13 Pin towbar applications.
eBay
European 7 Pin 12V Trailer Socket Tester High Quality Wiring Circuit Light Test Tool Truck
Aliexpress UK
This tester is for a trailer/caravan and tow bar socket/plug checker. 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
EU to US Trailer Light Converter 7 Pin Round Adapter European Trailer to 4 pin flat Socket American
Aliexpress UK
This tester is for a trailer/caravan and tow bar socket/plug checker. Automotive7Pin to 13Pin Towing Trailer Tow Bar Caravan Light Wiring Circuit Tester Plug Socket 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.
eBay
12V 7-Pin Connector Trailer Socket Heavy-Duty Round Wiring Socket Towbar Towing Caravan Truck Socket
Aliexpress UK
Automotive7Pin to 13Pin Towing Trailer Tow Bar Caravan Light Wiring Circuit Tester Plug Socket UK. This tester is for a trailer/caravan and tow bar socket/plug checker. -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
12V 13 Pin Trailer Plug Waterproof Trailer 13 Pole Electrical Connector
Aliexpress UK
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
1PCS Ds-13-04 square s large terminal generous 13 core 15 pin socket 13P pin DIN female socket male
Aliexpress UK
This tester is for a trailer/caravan and tow bar socket/plug checker. 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
Round Parking Cover Trailer Plug Holder ABS Accessory Bracket Fixed Trailer Connector For 7 /13 Pin
Aliexpress UK