This is the third relay I've ever had fail on me, my truck's fuel pump relay stuck once so it got replaced, I have a relay setup on the truck to keep the radio on until the doors are opened and it stuck on once, and now this. It can't very well rip this TRS relay box apart, it's solid epoxy once you take the covers off. I don't hear or feel any clicks when they turn on\off so I'm not sure if there's a mechanical relay in there or not.