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LED: Signal & Brake
LED Bulb Options for Turn Signal and Brake Lights
A lot of people assume any 3157 LED bulb will drop into any 3157 socket and just work. That is not quite true. The 3157 footprint covers turn signals, brake lights, and marker lights across a wide range of trucks and cars, but the wiring behind that socket is not always the same, and that detail decides whether your new bulb lights up correctly or flickers at you from day one.
Worth noting: a handful of Ford, Ram, Toyota, Subaru, Honda, Chevrolet, GMC, and Nissan vehicles use what is called a CK socket (also labeled SCK, SACK, or SRCK, as in 3157CK or 3157SACK). A CK socket reverses or shares the ground path instead of isolating power and ground like a standard socket does. Morimoto builds its 3157 LED bulbs with circuitry designed to handle both setups, so the guesswork is sidestepped from the start. One quirk worth knowing on the switchback versions: they flash amber then off, not white to amber, which is normal behavior and not a defect.
Even resistor-free LED bulbs can occasionally need a boost on certain vehicles to fully clear factory hyperflash or bulb-out warnings. On trucks like the 2014 Raptor, where brake and turn share the same 3157 bulb, even a Morimoto bulb's built-in resistors are not always enough. If that happens after install, our Adapters & Accessories page has the resistors and load equalizers to sort it out without sending anything back.
That said, most upgrades are simpler than the CK exception above. Figure out the job first: front turn signal, rear brake and turn combo, or an interior or marker application. Then match brightness and color to that job rather than just grabbing the brightest bulb on the shelf. Bottom line, we always recommend confirming the socket type before ordering if your vehicle is one of the less common ones, and lean on a Morimoto bulb built for both wiring styles if there is any doubt. If you are shopping headlight and fog bulbs instead, our LED: Low, High & Fog lineup covers that end of the vehicle.
15 Results
2-Year Warranty Anti-Hyperflash LED Signal Bulbs
Morimoto
2-Year Warranty Anti-Hyperflash LED Signal Bulbs
Morimoto
2-Year Warranty Anti-Hyperflash LED Signal Bulbs
Morimoto
2-Year Warranty Anti-Hyperflash LED Signal Bulbs
Morimoto
2-Year Warranty Anti-Hyperflash LED Signal Bulbs
Morimoto
