Actually you don’t. The fuses are just fail safe mana, if the tower is busted, I think you should be able to fix it even without a fuse. I bought one just in case.
For me the game just says cr1 is busted regardless if it is any one of them. 1/2/3 all display as cr1 by the global alarm. Red targeter is CR1, green is CR2, Blue CR3. Which one of them won’t move on the signal finder screen is your culprit.
