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Hello, I have a 2015 Kia Optima. I got switchbacks for the turn signal and the led comes on when I start the car but then when I hit my turn signal it works right. But then I turn it off and it doesn’t go back to led. Could this be the resistor not working or is my wiring incorrect? I tapped into pin 4 and 5 on the harness
 

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2013 Kia Optima
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You need to be tapped into three wires to use a switchback... The Running Light, the Turn Signal, and Ground.
 
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