Stop in for a cup of coffee

Need some advice on my car trailer. Wiring is kind of screwed up from the pig tail to about 3 feet. Taillights look good and wiring looks good under the trailer. Do I replace the whole thing or just replace the 3 feet of pig tail. Trailer is a 2005 but been inside in the winter months.
Replace the entire, what you call pigtail. Tie it into good wiring like they did when built...use bell connectors. Imo1720230810137.png