I would think the black wire would be a ground. Follow the red wire back where it goes and look for a terminal or post with a wire terminal but no wire. More than likely the terminal wasn't crimped properly and the wire just pulled out of it. One thing for sure, the connection point will be within the length of the wire from where it is now. Good luck!
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2015 Legacy SR340 360RB with 2014 Wrangler Unlimited Toad
Gigi, Poppy and Sadie the Jack Russell (all 14 lbs of her)
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!