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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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