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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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