3157 Switchback LED Front Turn Signal Bulbs White Amber | Built in Resistors, Dual Color, No hyperflash

3157 Switchback LED Bulbs with Built-in Resistors FAQs

What is a switchback LED?

Switchback LED bulbs are specialized turn signal lights designed for dual-filament sockets. They operate in two distinct modes: bright white when running lights are active during everyday driving, then instantly switching to vibrant amber when the turn signal is engaged. Once the turn signal cycle completes, they automatically switch back to white.

This dynamic color-changing capability creates a premium, distinctive lighting signature while improving visibility for both you and other road users. The crisp white/amber contrast provides clearer signaling in all conditions, enhancing both style and safety.

Why does my switchback light up amber as daytime running light (DRL) instead of white?

This happens because your vehicle uses the high filament (turn signal circuit) for daytime running lights rather than the low filament, which is common in specific models like Corvettes and various Toyota vehicles. To get white DRLs instead of amber yellow, simply turn on your low-beam headlights. This will switch the power to the low filament circuit, activating the white LEDs for your running lights.

Do I need to add a switch for LED Switchbacks to work?

Our 3157 Switchback LED light bulbs work with your vehicle's existing electrical system - no additional switches needed. They automatically change from white (when running lights are on) to amber (when turn signals activate). These plug-and-play bulbs install in under 10 minutes with zero wiring modifications needed for most vehicles. They're energy-efficient, environmentally friendly, and provide an instant lighting upgrade for your car or truck.

Why do my 3157 LED switchback bulbs only illumine one color instead of two?

This typically indicates a single-filament socket configuration. For proper switchback functionality, your socket must have at least 3 wires. If your socket has only 2 wires, it's a single-filament application that cannot support color-switching capability. No switchback bulb will display both colors in this case. If your socket has 3+ wires but still shows only one color, check that the metal contacts on the LED bulb are properly aligned and make a solid connection with your socket terminals.