So this morning I was hooking up a new radio in my truck. I had wire the new harnesses together and used wire nuts. When I was done I plugged it in and it worked great. I tryed to push it back in place but the wires where blocking it. So when I pulled it out the red power wire nut came off and it sparked. It blew the fuse so I replaced it. Now neither the old or new radio will turn on when i wire them up. Could I have damaged the wire internally or can the vehicle harness be bad? I have had to replace harnesses on this truck for some of the lights when I upgraded them.