Thank you factory
Trailer had only been lived in a few months, two trips to the dealer and various moving around. Never once had 12v system failed until now.
After disconnecting negative and charging battery to 12.7, i reconnect it and nothing, zero. Hours of checking and finally test the ground to the frame. Bolt and lug nothing, but actual wire good.
You guessed it, they crimped the sheathing and not the wire. Wonder how it ever worked.