Got my truck from a relative about 2 months ago and they took a subwoofer out before they gave it to me but never reconnected the speakers. Pretty sure the wire for it is loose in the back, thick blue cable insulation. Was recommended to check out cartoys so im gonna head there tomorrow but let me know if you guys know where I can do this or how I can do it by myself, cant seem to find out how anywhere online.
If it matters its a 1992 f150 xlt and has a Kenwood KDC-X700 as the stereo

 

You can always run your own speaker wire straight from the stereo. That's what I had to do. They are easy to hide under trim/carpet.