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Discussion Starter #1
Guys, My left blinker blinks normal, but within the last couple of weeks, when I turn on the headlights it begins to blink very fast. I don't have this issue with the right side blinker. It's driving me crazy. Any suggestions? I do have LED blinker lights installed with the resistors, and this is a new problem that just began. The blinker used to work just fine. Thanks.
 

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I had this issue when I installed LEDs (rear only) without resistors. I didnt know at the time I would likely need resistors, so I went back and installed the old school bulbs and have been happy ever since. Is it possible that the resistor is damaged or has a bad connection, causing the resistor to not do its job?
 

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You may have a bad ground. The parking lights and the turn signals share a ground, and if it is bad you may have little or no current through the turn signal filament with the parking lights on.

Do all three turn signal bulbs flash? Are they as bright as the ones on the other side?
 

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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.
 

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Discussion Starter #6
Thanks guys for the feedback. I will check what you suggested. It could be a bad ground as I have an aftermarket side marker turn signal kit installed. It could be something to do with the left side module. I will also check the battery voltage with and without the headlights on.
 

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LOL, that's pretty funny! Now I know why you put the word "Sly" in Sly Bob. Thanks for the tip! Haha!
 
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