What Do the Red and Green Lights on an Automotive Test Pen Indicate?

[VonAmara]

Automotive test pen red and green lights represent respectively: the red light indicates an increase in voltage, while the green light indicates a decrease in voltage. Below is relevant information about automotive test pens: 1. Definition: An automotive test pen, also known as an automotive voltage tester or test light, is a commonly used circuit testing tool for automotive electricians during activities such as installing additional automotive electrical components, modifying circuits, and performing repairs. 2. Function: It is used to detect whether there is voltage at the test point in the automotive circuit. For precise measurements, a multimeter is still required. 3. Structure: An automotive test pen consists of a pen body; at the front end of the pen body, there is a metal tip called the pen tip, used to contact the test point; inside the pen body, there is an indicator light (a small bulb or LED); at the rear end of the pen body, there is a wire connected to a clip. Some automotive test pens also include a fuse.