[rohrmann]

As others, I am having a hard time understanding why there would be power in the cord from the trailer, once it is disconnected from the tow vehicle. The tow vehicle supplies power to the trailer when connected, not the reverse. The tow vehicle supplies power to the brakes of the tow vehicle when the brakes are applied during normal operation. If the trailer separates from the tow vehicle while towing, obviously the cord will break loose and the breakaway switch will operate and if the trailer's battery is functioning, the brakes of the trailer will be set independent of the tow vehicle. Where is the power in the cord coming from when not connected to the tow vehicle?