Hello All new to the forums I just bought a 2014 F150 stx 5.0 everything stock. and I noticed that one of the back speakers was not working and one of the front speakers crackling so I figured it was blown speakers so I purchased 4 new speakers when I installed them the front speaker That was crackling worked fine and the back speaker still was not working so my question is what is the possibility that the wire running from the front to the back is bad or is it in the radio

 

Most likely it's a wiring issue. You need to verify with an ohm meter.