Help with wiring OEM LED turn signals that has 2 voltage inputs
I figured out the turn signal wiring! The headlight simply required two B+ inputs.



The Grand Touring and Signature headlights require 2 constant 12v inputs for each side of the front turn signals which the Sport and Touring harness is missing. 
What I did to test this theory was wire an always on 12v to the 2 wires- white/black wire and blue wire on the GT/Signature harness that I purchased, PN: TK50-51-0K6.

The wire color of the engine harness differs from the headlight harness. The white/black and blue wires on the GT/Signature harness connects to the Gray wire on the engine harness. 


There is an always on 12v at position 50 in the engine fuse box, which was also originally for the hazard and front/rear turn signals, to the white/black wire and the blue wire. 

Engine Fuse Box Diagram
https://www.autogenius.info/mazda-cx-9-from-2016-fuse-box-diagram/