On a 14-year-old trailer, that green wire could be almost anything that a previous owner may have installed.
On the other hand, it could be original equipment that just came undone because of those crummy (yellow) twist-on wire connectors.
First thing that I would check is to see if the taillights, brake lights and turn signals all work. Are there any add-on lights on the back of your TM?
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TrailManor Elkmont
640W solar- 230AH LiFeP04 Battery
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