Headlight Bulb Question

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Thor Hammer

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Dec 17, 2019
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Santa Cruz, California
This 2007 Expedition Limited came with LED bulbs in some aftermarket housings. I cannot for the life of me figure out what the lower bulb is for! The low/high beam bulb is indeed dual filament and made by DDM. Gets brighter when the high beam switch is turned on.

I cannot get the lower led bulb near the bottom of the housing to turn on. Fog lights work. Turn signals fine. Can someone educate me please? Thanks!
 
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