Thanks for the reply.
I had ended up figuring it out.
It was the factory subwoofer choke relay that is powered by the power antannae wire.
I just removed the relay since I am going to be putting in an aftermarket amp and sub anyways.
I just installed a new head unit in my son's 2001 TJ.
Everything works perfectly except there is a clicking sound (likely a relay) that sounds like it's coming from the instrument cluster when jeep is completely off.
It starts a few seconds after removing the key and then never stops till you...