I had an aftermarket trailer hitch installed on my 2009 LR2 a few years ago and after this winter have been having issues with the wiring (mainly it got really corroded and my trailer lights don't come on anymore). I'm not sure if the wiring is something they added when adding the hitch or if it was factory installed. I would assume there must be a fuse location for this somewhere? Any idea where that typically would be (should be standard if some of this wiring was already installed in the factory but I don't know if that's the case).

I might have to rewire this because the plug got bad (though I've cleaned it up a lot since) but I want to verify first this isn't just a blow fuse somewhere.