So, your spring checklist mission is to now look through your own boat and see how many DC electrical connections like this you can find without protective boots on the terminals. Typical locations are anywhere is the engine(s) starter circuits, bow thruster circuits and anchor windlass circuits. In the case of the starter circuits, they are the only circuits on your boat that are not required to have fuses or circuit breakers installed. So, if a short circuit does occur at one of these un-covered terminals, a fire could start! In the case of the bow thruster, it could simply be the reason for the entire lower leg of the thruster corroding away in a day or so once you launch the boat.