They dont work. the fuse keeps blowing everytime i try and put a new one in. it might be because of the system i have with a dual cd player, and 2 roadthunder mtx 12's. any help?

you are overloading the electriacl systen and to prevent damage it blows the fuse best thing to do is take some of it out or take it to a audio shop and tell them what is going on and they can put the right wires to support that kind of load