If this is indeed a custom installation please read/refer to the wire color codes. RED, NOT YELLOW, turns on the left turn signal/brake light. I'm still scratching my head as to why they coded that pigtail appropriately. I was sure I connected it correctly with the 4 wires I have (yellow, green, brown and white), but it's not. I added more time to my setup by crawling back under the car to fix it. PITA, otherwise a very good product.
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