Does a Headlight Brightener Really Work?

[DanielMarie]

The so-called headlight brightener is essentially adding two headlight relays to the original vehicle's headlight circuit. For vehicles with aging wiring and poor contact issues, installing one can have some effect. However, for vehicles with normal wiring, installing it may not be useful. Here is the relevant introduction: The headlight brightener uses the original vehicle's headlight switch group to control the coil winding of the brightener's relay, thereby opening and closing the relay's contacts. When the headlight switch is turned on, current flows through the relay's winding, and the magnetic field generated by the coil magnetizes the iron core, causing the contacts to close. The positive current from the battery flows from the fixed contact through the moving contact to the headlight bulb and then back to the battery's negative terminal via the return line.