You won't need any type of converter when installing the Curt Universal Tail Light Wiring Kit # C63CR on your 2013 Lincoln MKS. However there is a distinct process that you'll want to follow to determine how this system will be installed that tells you whether you've got a 2 or 3 wire system and how to install the unit. It sounds like you might have installed this in a 3 wire configuration but there is no power on the turn signals.
I would start by checking any and all ground wires that... view full answer...