Features: 1.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 very convenient. 2.Ergonomic design of the 7 Pin trailer socket will ensure its work of high performance. 3.This trailer tester can help you to quickly check the circuit failure of both vehicles and the electrical system on trailers. 4.Made of ABS plastic and copper,which is durable and you can use it for a long time for its long service life. 5.Ideal in the commercial and private sector, for workshops, car and trailer rental, accessory trade, etc. Specification: Specifications:_x005F_x000D_ Main Material: ABS & Copper_x005F_x000D_ Color: black_x005F_x000D_ Item Type: Diagnostic Tools_x005F_x000D_ Item Name: Trailer Tester_x005F_x000D_ Size: approx. 20 * 5 * 4cm_x005F_x000D_ Battery Type: 9V (not included, you need additional purchase)_x005F_x000D_ Package Size: 20 * 5.5 * 4.5cm / 7.9 * 2.2 * 1.8in_x005F_x000D_ Package Weight: 194g / 6.8oz_x005F_x000D_ _x005F_x000D_ Package list: _x005F_x000D_ K4216_x005F_x000D_ 1 * 7-Pin Trailer Tester Tool_x005F_x000D_ _x005F_x000D_ Function & guide:_x005F_x000D_ Trailer (can also be a caravan or bicycle carrier)_x005F_x000D_ _x005F_x000D_ Put the plug in the connection of the tester._x005F_x000D_ _x005F_x000D_ Press the yellow button on the side of the tester. _x005F_x000D_ If the wiring is good, all the LEDs light up. the function of each LED is (acc lso 1724):_x005F_x000D_ 1. left hand indicator (yellow);_x005F_x000D_ 2. foglight or 12V (blue);_x005F_x000D_ 3. mass (white);_x005F_x000D_ 4. right hand indicator (green);_x005F_x000D_ 5. right rearlight (brown);_x005F_x000D_ 6. left brake light (red);_x005F_x000D_ 7. left rearlight (black). Attention: The pin no 2 can be used either for a warning foglamp or a permanent 12V connection._x005F_x000D_ 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._x005F_x000D_ _x005F_x000D_ Car, camper_x005F_x000D_ 1. Put the tester in the socket of the car._x005F_x000D_ 2. Press the yellow button on the side of the tester._x005F_x000D_ 3. If the wiring is good, all the LEDs light up. Do again steps 4 as previous._x005F_x000D_ _x005F_x000D_ You can also test the functions of each pin of the socket._x005F_x000D_ 1. Switch on the left hand indicator (after switching on the ignation key)._x005F_x000D_ 2. The corresponding LED must flash with the same frequency. If not, left hand indicator wiring is defective/broken._x005F_x000D_ 3. Repeat steps 1 and 2 for the right hand indicator, rearlight, foglight and stoplights._x005F_x000D_ With a +/- 4 m extension cable, you can test the functions form the driver's seat more easily. _x005F_x000D_ _x005F_x000D_ _x005F_x000D_ Note:_x005F_x000D_ This product is European style, please confirm before ordering. PackageList: