Good Evening everyone, I'm new to the forum but I also had blinker issues. I bought spoiler leds with the fog light harness, upper brow and lower brow from Slingmods hooked everything up and the drivers side would blink fast. If I turned off the fog light switch the blinkers would only blink once then stop. I tore my SS apart 4 times trying different ways of connecting these leds. I noticed that when I would connect and disconnect the factory harness from the drivers side port I would have to really push the connection in to get the marker lights to work. So I removed the drivers side light and plugged it into the passenger side port and the same thing happened. So I got into my vehicle and drove to the Polaris dealer they ran a test on the drivers side light and it was defective lucky for me I'm still under warranty if not that would've been a $216 purchase. So if your having issues on one side I would have the dealer test the lights. Part is on order once I get the new light I'll do an update post.
You did some good trouble shooting by moving the lights to see if trouble moved. That will help others with similar troubles. Thanks for sharing. Welcome to the Slingshotinfo forum.