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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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