Trailer Lights Not Working

[Eatonpcat]

Need a little help, Not that it makes much of a difference, but 2020 Tradesman CCSB, 6.4L. First time hooking up my trailer - 18 foot 10k Equipment trailer - Aired up the tires, greased the hubs, connected to truck, plugged in 7 pin wiring harness, turned on lights and checked turn signals. Both right and left lights and signals worked. Unplugged harness, squeezed a bit of di-electric grease in each slot, plugged harness back in, took her for a ride around the block and you guessed it, no rear lights or signals. The only lights that work are the amber running lights on each side. Another note, when I unlocked the truck this morning, the right side rear light and the rear center lights flashed with the truck lights. Could it be that I blew a fuse?? If so, can you direct me to the correct fuse and embarassingly enough, point me to where the fuse box is located? Thanks in advance for any advice

 

[LateToTheParty]

Fuse box is located in the engine bay, drivers side just in front of the battery.

Check fuses F28, F29 and F30 (backup, parking, tow receptacle)

 

[Chrisminx]

Also check the fuses for trailer turn signals. I have a trailer that always blows the right turn signal fuse. I have to keep extras on hand. I believe my issue is wirh the trailer. This has happened with my current and previous trucks.

 

[Eatonpcat]

Thanks, I will check those fuses in the truck and the trailer.