389 Clearance/Tailight Issue

Check the bulbs? Weird they'd both go out at the same time, but I've seen it happen. Is there a connector in the harness near the rear crossmember? Try unplugging that and checking the wire terminals with a circuit tester. If you have power there, check the ground connection.

 

Gotch. That's a headscratcher. Maybe trace the wires, see if you can find a terminal that pulled partially out of a connector or frayed wire or the like. Warranty an option?

 

I haven't had the pleasure of lifting the hood on a 2014 but my 09 389 has that fuse box on the right side of the firewall.. and the panel behind the glove box had a few loose connections on mine caused all kids of weird stuff.. I know you said the fuse if okay but are you sure there is only one fuse for the parking lights.. I cant remember if there is more than one on mine or not and unfortunately its 130 miles away from me at the moment or I would check it out. stupid idea here but try the interrupter switch just keep flipping it a couple times maybe your coffee splashed on the dash lol

 

Its a 2014 and must be under warranty , don't mess with it yourself , just take it back and get it fixed by the dealer , afterall thats why you bought a new truck ? No ? Mess with it yourself and chance gewtting the warranty voided .

 

I wasnt trying to make a fool out of you driver.. im glad I could point you in the right direction I guess the fuse box got moved to the left side on the new ones.. I hope you got back on the road..