13-pin Trailer Spark Plug Tester, Heavy Duty 12V Car Trailer Wiring Circuit Diagnostic Tool with LED Indicator for Motorhomes and Cars

From the trailer or car, press the yellow button to test, and the LED light will quickly display the line status, convenient and fast. 4. Wide Application: The tester applies to a variety of 13-pin plugs and sockets and can be used for different types of vehicles such as motorhomes, trailers, and automobiles to meet diverse needs. 5. Comprehensive Testing: The 13-pin trailer spark plug tester quickly identifies problems with your trailer wiring, making it an essential tool for maintenance and safety. Spec: Material: Copper - Nylon - PVC Board Features: High temperature resistance, low temperature resistance, acid and alkali resistance INTRODUCTION: Trailer (can also be used for motorhomes): 2. Press the yellow button on the tester. 3. If all the LED lights are illuminated, this indicates that the wiring is normal. Each LED light has the following functions: 4. If none of the LED lights are illuminated, the wiring connection is incorrect. Vehicle: 1. Connect the tester to the vehicle's socket. 2. Press the yellow button on the tester. 3. If all the LED lights are illuminated, this indicates that the wiring is normal. 4. Test the function of each pin on each socket: Turn on the left turn signal; the first LED (yellow) on the tester should light up. If the LED does not light up, this indicates a wiring connection error or damaged wiring. 5. Repeat these two steps to test the right turn signal/fog light, etc. Package List: 1 x 13-pin Trailer Spark Plug Tester