can you even replace it without having to really mess with the stock wiring or do the wires have a connection nearby that's easy to undo?
I’m thinking he’s talking about the smaller one that’s near by the main harness. I personally would not be messing with that harness.
That would be the one, It sits a bit higher up from the one where the main harness is. Probably about the size of a penny or nickle at most?
90950-01955
Run that through Google images. Is that the one?
I ran my grill lights to a switch in the cabin through that hole. For some reason, I found a rubber grommet with a hole in it from a prior project that was just the right size in my miscellaneous box of stuff. I used that to replace the stock plug, which I don't need anymore. DM me if you want it and I can send it your way (I'll probably have to find it in my miscellaneous box of stuff, but it should be near the top since I just did it.)