I have a question regarding my power distribution center and the relays. looking inside of mine there's a lot of empty spaces and it looks like they're supposed to be something plugged into it because it's not just empty like the spaces that are for extras. I have a 2004 Wrangler X it's a 4L 6 cylinder TJ. How do I know what relays I'm supposed to have them relays I'm not supposed to have?