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Btw, I don't think you need that resistor if the mrs' truck doesn't have a 'bulb out' feature for the fogs. Unless it's actually easier to assemble it with the resistor than without it.
The LED Resistor is specifically for newer cars equipped with Bulb Out Warning Systems. Since LED bulbs have no filament, the warning system will think the bulb is burned out and a error message will be displayed on the instrument panel. With the resistor installed, the warning system will be "fooled" into thinking an incandescent bulb is installed and working properly so there will be no warning light.
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