Join Date: Nov 2009
Location: Gaithersburg, MD
Mentioned: 34 Post(s)
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Given this only happens when you increase the load (headlights on) I would say that your battery is going south. Your resistor/LED combination is probably on the hairy edge of the BCM "bulb out" levels, with the left taking a bit lower current than the right. Once the load increases, the applied voltage drops and the left blinker drops just below the threshold.
So, either your battery, or your alternator is my guess. Try checking the voltage levels while your car is running, with & without headlights.
Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...