7 Pins Towing Trailer Tow Bar Caravan Light Plug & Socket Wiring Circuit Other Kitchen ITEM NAME:Car Bluetooth AUX Adapter

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7 Pins Towing Trailer Tow Bar Caravan Light Plug & Socket Wiring Circuit Other Kitchen ITEM NAME:Car Bluetooth AUX AdapterITEM NAME: 7 Pins Towing Trailer Tow Bar Caravan Light Plug & Socket Wiring Circuit img *{margin: 0; padding: 0;. 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.