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Headlights are basically a sealed unit [but not air/moisture tight.] Thats why there is a drain/vent tube at the bottom of the unit on the inside/back. The seam between the back side and the clear plastic lense may have cracked or opened to allow more that designed amount of moisture in. You might try removing the entire unit [screws in back] and re-sealing the lense to the back of the unit. Under "normal" conditions some moisture will get in and the heat of the bulbs will eventually dry out the lense cavity.
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas