installing my NX bottle heater and in the wiring diagram they dont show a inline fuse to be installed anywhere. It pulls voltage from the battery then runs it through a relay. Does the relay act as a fuse? I guess the relay will break the connection, if i have a short, and keep the car from burning to the ground ??? Their tech line isnt open today and of course i'm impatient and want to get this thing going on my day off so i can test it out. Any input is appreciated!