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
1 Piece 3.5mm Stereo Headphone Jack Splitter Adapter Plug 1 for 2 Socket plug splitter Y adapter Drop Sending
Aliexpress UK
Used on newer cars with a 13 pin plug on the towbar. Adaptor Trailer Extension Lead Caravan Towing Socket Plug Board 13 Pin to 7 Pin. Brass electric shock: brass is used as a conductor, which is more conductive than ordinary materials.
eBay
American Detachable Plug American 15A AC Electrical Power Male Plug Adaptor Adapter Wire Rewireable Extension Cord Connector
Aliexpress UK
1 x Trailer Adapter 13 To 7 Pin Trailer Adapter Trailer Wiring Connector 12V Towing Plug N Type. Weather proof sprung locking flap protects the connections when not in use and locks in the 7 pin plug, when in use.
eBay
TESSAN 100W GaN Universal Travel Adapter with USB &Type C Fast Charging International Plug Adapter EU/UK/USA/AUS Plug for Travel
Aliexpress UK
Upgrade your trailer's electrical system with this high-quality 7-pin trailer plug connector, designed for heavy-duty cargo trucks. Easy to install and compatible with standard trailer wiring, this connector is a must-have for any serious haulier.
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1pcs Universal EU Plug Adapter International AU UK US To EU Euro KR Travel Adapter Electrical Plug Converter Power Socket
Aliexpress UK
For the connection of a trailer equipped with a 7 Pin plug to a towing vehicle equipped with a 13 pin socket. To convert a 13 Pin socket into a 7 Pin socket. Adapter 13 Pin Car or Vehicle to 7 Pin Caravan or Trailer.
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1pc UK Plug Adapter US American EU European AU Australia To 3 Pin British Travel Power Adapter Plug Socket Electric Outlet
Aliexpress UK
13 to 7 Pin Trailer Truck Electric Towing Converter Tow Bar Plug Adaptor Socket. Converts the 13-pin socket on your car to the 7-pin female socket. PIN 1 - Yellow Wire (Left/H Direction Indicator). PIN 4 - Green Wire (Right/H Direction Indicator).
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Universal AU UK US EU Plug Adapter US to EU Plug Converter Australian KR Euro Travel Adapter Power Electric Socket AC Outlet
Aliexpress UK
13 Pin to 7 Pin plug tow bar socket adapter converter for trailers. Converts the 13pin socket on your car to the 7pin female socket. Pin5 Brown R / H Tail & No. Plate Lamp. Pin7 Black L / H Tail & No.
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250V/5A 1PC Universal UK/US/EU/AU to Small South African 3pin Travel Plug India South Africa Converter Adapter plug Adaptor
Aliexpress UK
Converts the 13-pin socket on your car to the 7-pin female socket. PIN 1 - Yellow Wire (Left/H Direction Indicator). PIN 4 - Green Wire (Right/H Direction Indicator). Supplies power to your towing and truck.
eBay
American Detachable Plug American 15A AC Electrical Power Male Plug Adaptor Adapter Wire Rewireable Extension Cord Connector
Aliexpress UK