I have a pioneer head unit that I know works fine for sure because I tested it in my other car. But the head unit continues to play but I get no sound. Sometimes over bumps or something it will cut in for a second but then short out again. I could see if just one or two speakers did this by haveing a short in the wiring to them. But would all 4 speakers be shorting out at the same time? Should I rewire all 4 speakers individually from the reciever?