So I hooked up my buddies system today and it came with a fuse block, so we cut the power wire and installed the fuse block and we setup his whole system with the fuse out. We hooked it up to the battery and to his amp, but when we try to stick the fuse in, it sparks. We cannot figure out why because his car is completely off, and we cant put the fuse in, because it is obviously sparking.
Any ideas?