Test Light
A test light is a simple tool that lights up when voltage is present.
What is Test Light?
It is cheap and quick to use. It shows whether a circuit has power. LED versions draw very little current. Many technicians prefer a logic probe or LED test light for modern circuits. A test light is still useful for checking fuses and finding power quickly.
How it works
Current flows through the bulb when connected.
Why it matters for your car
Do not use incandescent types on sensitive circuits. A multimeter gives exact values.
Other terms
- AdBlue Heater
- Backfire
- Brake Light Switch
- Corrosion (Rust)
- Flex-Fuel Vehicle (E85)
- Fuel Cap
- GAP Insurance
- Hill Descent Control
- Keyless Entry And Start
- Lead Loading (Body Solder)
- Leather Conditioner
- Locking Differential (Diff Lock)
- Piston Pin (Wrist Pin, Gudgeon Pin)
- Public Charging Tariffs
- Second-life Battery
- Terrain Modes (Drive Mode Selector)
- Thermistor (Temperature Sensor)
- Toll Vignette
- Vinyl Wrap (Car Wrapping)
- Window Switch