Trailer Wiring Harness Cover
thingiverse
I needed a cover for the wiring harness to my trailer, since it sits out in the weather all the time. Without a cover the contacts get all corroded and difficult to use such that the lights on my trailer stop working. If this doesn't exactly fit your harness you can scale the size up or down. Since most harnesses have a hard-ish rubber material you only need to make this snug up against that to get a good seal.
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