Looking at a 2016 with 50,000 miles on it. Has a yellow wire with tape on it attached to the positive battery post. Routed through what appears to be a factory hole in the battery tray. Any ideas as to what this is or if anyone else has this on their stock setup. Thank you - Matt
Most likely for an aftermarket trailer light relay. They are usually red, but some are yellow. Only way to know for sure is to trace it or pull the fuse and see what doesn't work.