I would suggest using a fuse tap pictured below. Just replace one of the fuses that I point to in the diagram with this fuse tap and then install that same fuse (if a replacement of the same size is not provided) and then use the pigtails to wire in your switch. At this point your switch will be active with the lights are on as you wanted.
Let me know if you have questions. Thanks
Images (Click to enlarge)
Sunday, July 12th, 2020 AT 6:23 PM