Hi so I have been noticing that after a while my battery would go dead even though it had plenty of life and it recharged fine. I left my truck off and I have been noticing what sounds like a relay clicking really fast for about a second ever 30 seconds or so when the vehicle is turned off. Is there something back there that might be draining my battery due to a bad connection or possibly a bad relay/fuse?

 

Need to figure out which relay it is, thus, what system it is part of, take it from there.