I forget the model years involved, sometime in the 1980's to sometime after the 2000's, but the molded plastic grill had molded gussets to keep the grill square and created a "resonant frequency of vibration" that coincided with the resonant frequency of the parking light bulb filament that caused the light to burn out in seconds or minutes instead of lasting hundreds of hours. Cutting the molded in gussets changed the resonant frequency of vibration and let the bulb last the normal hundreds of hours.
I read this in an issue of Car and Driver Magazine if I remember correctly. But trucks of that certain vintage, 80-90% will have one burned out light, sometimes left, sometimes right.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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