I just bought the bullet turn signals for my 2016 road king. The kit came with three wires black,purple,and blue. There is a fourth wire on my stock setup wich is grey. Did you have to splice into the new bullet wire to make this work. Or did i get the wrong kit. Thanks

 

bumping this old thread. I have the same question as the HD instructions don’t address the 4th wire.

 

Grey is an auxiliary light wire.