clicking under steering wheel

any one know anything about what is underneath the steering wheel? I can't find any diagram or anything that can help me figure out what it is I need to address. I think I found the exact spot but I have no idea what part to look up or anything. just.... under steering wheel. not sure why it's so hard to get info on it. next time I'm out I suppose I'll get a repair manual but you'd think it'd be on the Internet. anyway. brand new battery already has all that blue buildup and it drained completely dead so I need to replace or fix whatever that plug is that's clicking