Dual fuse holder makes it easy to add an additional circuit to your vehicle’s electrical system. You can find a selection of dual fuse holder turns one fuse slot into two on Amazon, eBay, or even your local auto store. Simply select and remove a fuse (not to exceed 10 amps) from your fuse box with constant (always on) or switchable (only turns ON/ACC) power capabilities that match the requirements of the accessory you want to add, and instantly gain another circuit!
Learn more how to tap into a fuse - https://youtu.be/8b9CvUMcNQo?t=269