This 7 pin trailer tester plug 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, which can effectively test what the problem is for 7 pins plug and socket connection.
7-Pin Trailer Tester Plug

Copper tester plug, this 7 pin trailer tester is corrosion and abrasion resistant, durable to use.

Function & guide:
Trailer (can also be a caravan or bicycle carrier)
Put the plug in the connection of the tester.
Press the yellow button on the side of the tester.

If the wiring is good, all the LEDs light up. the function of each LED is:
left hand indicator (yellow);
foglight or 12V (blue);
mass (white);
right hand indicator (green);
right rearlight (brown);
left brake light (red);
left rearlight (black)

Attention: The pin no 2 can be used either for a warning foglamp or a permanent 12V connection.

If a LED doesn't light up, it is because the corresponding wire is defective. If all the LEDs don't light up, then the mass wire is damaged or all bulbs are defective.

Specifications:
Main Material: ABS & Copper
Color:black
Item Type:Diagnostic Tools
Item Name:Trailer Tester
Size: approx 20 * 5 * 4cm
Battery Type:V (not included, you need additional purchase)
Package Size:20 * 5.5 * 4.5cm / 7.9 * 2.2 * 1.8in
Package Weight:194g / 6.8oz
Note:This product is European style, please confirm before ordering