Following up...problem solved. My nephew brought the trailer to my house. I've had my trailers successfully plugged into a dedicated 15amp plug for years without issue. Using my working cables his trailer came to life without a problem. We started using his stuff and isolated his 50 to 30 amp dog-bone as faulty. Used my dog-bone in it's place and everything worked again.
Now he knows what he needs to eliminate too many adapters in the string and to replace that dog-bone.
Thanks, all, for helping to troubleshoot.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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