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I just got a new set of LEDs from Mototeck to replace the rear turn signals. The old ones the solder connection vibrated free from the PCB. ANyway Mototeck just sent me another set since they were under warranty. The old oned had 1 black and 1 yellow wire. Real easy to hook up. These same part and all have an additional grey wire? I cant tell what it is by where it attaches to the PCB and what is it supposed to hook up to? I dont wanna pop the leds doing the trial and error thing. Mototeck takes forever with email responses and haven't been answering the phone for the last 2 days. Just wanna get these in so I can ride Sunday. Any help would be great. thanks.