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Switchback LED Turn Signal Bulbs | Dual-Color White & Amber LED Signals

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Dual-Function Switchback LED Bulbs with Built-in Resistors

This exclusive Underground Lighting collection focuses exclusively on dual-colour LED Switchback turn signal bulbs, engineered to perform two lighting functions in one bulb. A switchback LED bulb outputs white light for DRL or parking light operation, then automatically switches to amber (or red in rare rear applications) when the turn signal or brake function is activated. During signalling, the white light is electronically disabled, complying with DOT / SAE signalling rules that prohibit flashing white light.

All products use solid-state LED technology (p-n junction electroluminescence), delivering instant response, consistent brightness, and long service life without filaments or gas. The collection supports the most common dual-contact wedge bases used for switchback applications: 3157, 7443, and 1157, which electrically emulate traditional dual-filament halogen logic through integrated LED control circuitry.

Available products include 3157 switchback LED bulbs, 7443 switchback LED turn signal bulbs, and 1157 switchback LED bulbs, along with vehicle-specific front turn signal kits for platforms such as 2019–2022 Ford F-250 and 2020–2021 Dodge Ram. These kits are designed for reflector housings, where wide light dispersion improves front and side visibility.

Premium variants include switchback LED bulbs with built-in resistors, which correct hyperflash caused by the lower current draw of LEDs. White output typically ranges 5000K–6000K, matching modern LED headlights, while amber output remains within ≈2000–2500K, meeting regulated turn-signal color standards and the best part is it’s hassle-free installation.

Click here to contact our experts and find the right fit for your vehicle at Underground Lighting.

Why Choose Underground Lighting Switchback LED Bulbs?

  • Two Functions in 1 Bulb

    Switchback LEDs combine DRL/parking light and turn signal into a single unit, reducing bulb count and simplifying front lighting layouts.

  • Automatic White-to-Amber Signal Logic

    Integrated control circuitry ensures white light turns off during amber blinking, meeting FMVSS 108 / SAE J578 signalling requirements.

  • Instant Response for Safer Signalling

    LEDs illuminate without delay, improving reaction time and visibility compared to incandescent bulbs with filament lag.

  • Reduced Hyperflash With Built-In Resistors

    Switchback bulbs with integrated resistors maintain OEM-correct blink rate, eliminating fast blinking without external load modules.

  • Lower Power Draw & Heat Output

    Operating at approximately 5–8W vs 20W+ halogen, switchback LEDs reduce electrical load while maintaining consistent brightness.

  • Clean, Modern Front-End Appearance

    White DRL output blends seamlessly with LED headlamps, delivering a uniform, modern look without adding extra DRL fixtures.

How to Find Out Which Switchback LED Turn Signal Light Bulbs You Need

We're experts in everything you need to know about Switchback LEDs. Whether you're installing them for the first time or upgrading your current setup, finding the correct bulb and fitting the replacement is simple.

Check your bulb number in three quick steps:

  1. Remove your current turn signal bulb carefully from the housing and locate the part number on its base. Most vehicles use standard sizes like 3157, 7443, or 1157.
  2. Enter your vehicle's year, make, and model into our finder tool to confirm your exact fitment. Can't find your bulb number? Check your owner's manual under "replacement bulbs" or "light specifications."
  3. Choose the Switchback LED bulbs you need and complete your purchase with confidence – our guarantee ensures you'll get the right bulbs for your vehicle, every time.

Need help finding the perfect Switchback LEDs? Our lighting professionals are ready to help – just call, email, or chat with us today. 

Need switchback turn signal LEDs for your particular make and model? Use our vehicle part search!

Vehicle Part Search

LED Switchback Turn Signal Bulbs FAQs

Are switchback LED lights legal?

Yes, Switchback LED lights are legal in most states when properly installed as turn signals. They comply with Department of Transportation (DOT) regulations by maintaining the required amber color for turn signals while operating. However, we recommend checking your local regulations, as specific requirements may vary by location.

How do I install a switchback LED turn signal?

Installing Switchback LED turn signal bulbs can be an easy and straightforward process:

  1. Locate and safely remove your existing turn signal bulb
  2. Unplug the old bulb from its connector
  3. Plug in your new Switchback LED bulb
  4. Test the lights to ensure proper white and amber operation
  5. Secure the bulb housing back in place

Most installations take just minutes per side with no special tools required. If you experience any flickering or error messages, our included load resistors can easily resolve these issues.

Are switchback turn signals energy-efficient?

Yes, Switchback LED bulbs are highly energy-efficient. They typically consume 50-60% less power than traditional halogen bulbs while producing brighter light output. This reduced power consumption puts less strain on your vehicle's electrical system and helps extend bulb life.

Are switchback turn signals reliable in all weather conditions?

Switchback LEDs are for year-round performance. Their weatherproof construction keeps out moisture, dust, and debris while operating reliably in extreme heat and cold. The powerful LED output cuts through rain, snow, and fog more effectively than traditional bulbs. Whether you're dealing with summer storms or winter conditions, these lights maintain their crisp white illumination and amber signaling without dimming or delayed color transitions.

Are there different colors available for switchback turn signals?

Switchback turn signals are specifically designed to switch between white and amber to meet safety regulations. While some aftermarket options may offer different color combinations, we recommend staying with the standard white-to-amber to guarantee legal compliance and optimal visibility.

Do I need a white or an amber turn signal?

In North America, amber turn signals are the legal standard for all vehicles. Other drivers recognize amber signals more quickly, and reaction time is reduced by up to 0.3 seconds compared to red brake lights or other colored signals. 

Our Switchback LEDs automatically handle this requirement, displaying the correct color at the right time. When you're finding a new bulb, you won't need to choose between white or amber LED switchback turn signal lights - the dual-function technology does this for you. 

What's the difference between 3157 and 7743 switchback LED bulbs?

The main difference between 3157 switchback LED bulbs and 7443 switchback LED bulbs lies in the base type and vehicle fitment. 3157s have a wedge-style base with offset pins and are commonly found in American vehicles, particularly Ford, GM, and Chrysler models. 7443 bulbs have a plastic wedge base with two offset pins and are typically used in European and Asian vehicles, including many Toyota, Honda, and Volkswagen models.

While both bulb types provide the same white-to-amber Switchback functionality, they're not interchangeable due to their different base designs. Always check your vehicle's specifications or use our Vehicle Finder tool to ensure you select the correct bulb type for your specific make and model. 

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