Hi all.....looking for an answer. I noticed today while changing a rear bulb that on the tail lights...the upper of the two bulbs is a dual filament bulb, however, I have only seen it light up as a tail light bulb. So....why the dual filament..? Hope this makes sense...just bugged by it and looking for an answer....

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2001 4.4 Titanium Silver, OEM Running Boards, Tinted Driver/ Passenger windows, Clear Side Markers, Clear/ Red Tail Lights, Axxis brake pads, and just added...Bosch Icons!!!!