IMO...Only down side to not having hardly any fuses in a wiring harness is that if you ever have a short in your wiring and believe me, it sometimes happens, you will melt any wires associated with the short. This is often a pain in the butt as sometimes can take out entire wiring harness or even start a small fire. I have my main 12 VDC supply, alternator, and fuel pump fused. A fuse for a the Setrab fan is not a bad idea depending on how much current they draw. Again, you can install fuses at your discretion, but would recommend fuse holders for the newer style plastic fuses. The newer style fues holders seal much better and are less prone to spring failure or coming loose at the most inopportune time. Good luck!