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I have 45k miles on my 2017 titan Pro 4X towed my trailer today and the brake lights and turn signals are not working. Running lights work. Any one have this happen? Any suggestions?
 

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Start with the basics. Check the wiring at the plug for signal (to isolate it to either your trailer or your truck). If you're using an adapter, check for continuity through the adapter after you check the truck plug. If that checks out, start looking at fuses and relays. If those check out, you're going to have to isolate which signals are not getting through, and trace wiring to find the short/break. Hopefully you find it before it gets to that point, as tracing wiring is a pain.
 
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