I just finished installing the Pop & Lock Tailgate lock on my '14 SC. The passenger side wiring wasn't behaving as expected, per the page 1 instructions in this thread. Tapping into the Blue/green stripe definitely affected the locking system, but not in a good way. All of the door solenoids on the truck went into a constant cycle of trying to re-lock 2x per second until I disconnected the wires. Changing to different grey/brown stripe wires didn't help, and neither did reversing the connection. I tested the solenoid direct to the battery, and it definitely cycled correctly. What finally worked was connecting to one of the grey/brown stripe wires, and to the violet/grey stripe wire. Works perfectly. I don't know if something changed on the '14s or if it was user error.
I ran the wires through the passenger side frame rail back to front, as suggested earlier. Makes for a nice clean install.
I'm attaching a photo of the correct '14 wires. Hopefully it will save someone a couple hours of head scratch'n.