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This set of four HP24 3157 dual-color LED bulbs provides switchback functionality and instant-on LED indicators for compatible GMC Sierra 2500/3500 front turn signals. They illuminate bright white for running/parking light and switch to intense amber for turn signals, matching factory brightness ratios across multiple levels. Plug-and-play 3157 fitment requires clear reflectors to view white properly; if hyperflashing occurs, adding resistors (sold separately) corrects load-related blink rate differences.
Diode Dynamics 3157 LED Bulb HP24 Dual-Color LED - Cool - White Set of 4
