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Buick LaCrosse Headlight Relay provides complete battery power to the lamps for enhanced, brighter, more reliable nighttime vision while lessening the load on the dashboard switch. The Buick sedan itself shines with quiet comfort, sculpted styling and engines ranging from the efficient 2.4 liter four to the eager 3.6 liter V6 that provide LaCrosse owners with a smooth but spirited ride. Engineers have reduced weight using high strength steel and added thick sound insulation, which makes the cabin feel calm even at highway speed, while the chassis feels crisp in corners. Recent editions of LaCrosse also include eAssist hybrid technology that combines a gasoline engine with an electric motor for improved gas economy without sacrificing acceleration, keeping LaCrosse competitive in its class. Such thoughtful engineering is what keeps Buick drivers attracted to the brand for luxury, value, and reliable performance. Central to that dependability, the Headlight Relay utilizes a low current trigger from the stalk switch to turn on a high current path right from the battery, reducing voltage drop and protecting internal wiring, and this Headlight Relay design performs well in harsh weather. Because the Buick lighting circuit passes through this smart relay, headlights remain bright in rain, fog or dark rural roads, providing increased safety and longer bulb life. Installing new Headlight Relay, disconnect battery, mount near the fuse box, run battery, connect output and trigger wire to relay ground well, reconnect battery, test.