left marker light dim?

[Thomcat]

If it is a filament bulb, might just be clouding/darkening of the inside glass of the bulb. Happens if air is not completely excluded from the glass envelope during the manufacturing process when the inert gas is injected just prior to sealing the bottom half of the bulb containing the filament and contacts......especially common when a metal base is fused to the glass. Darkening is easy to see if you can get a look at the bulb.

[fedmogul89]

I think the bulb is an LED. i know my headlights are HID. The bulb worked perfectly fine until the day before I posted this post pertaining to it. So I'm not sure if the housing not being sealed properly would cause issues months later or not?