SAE short circuit connector, the male port is "+", the female port is "-", and the voltage of the SAE power line under test should be within the range of 3-36V. SAE polarity reversing adapter. If the polarity of the SAE port being to do not match the polarity of this tester, you will need to use a polarity reversal connector to convert the polarity before you can perform the test accurately. SAE Short Circuit Connectors Tester detects the presence of voltages and signals in SAE harnesses. ATTENTION!!! When the tester LEDs are illuminated, the wire is properly energized. If there is no light, it means incorrect polarity. Plug and play, sturdy and durable. Small and lightweight, easy to carry. Easily detect the power cord connections of the solar panel plug., Manufacturer: Bumdenuu