At 24V the LV0401 will draw 0.1 of a amp so if you have 2 running at the same time they will be drawing a total of 0.2 of a amp. This is a very minor current draw and you will not need to run relay. With fusing it depends if you are running new wire to the Lights or if you are just using the old interior light wiring. If you use to existing wiring you could just use the old wire and would not need a fuse. If you are running new wiring you can use just a 10 Amp fuse just to be safe if you wish.