The top one is a fuse holder for your main power wire. Put it inline on your main power wire as close to the battery as possible. The bottom is a distribution block. your main power wire connects to the large input. Then the two feeds go to what ever your powering. When I'm using a cap in somebody's setup. I usually wire the cap after the distribution block as close to the amp as possible. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif