F150 2000 right stereo speaker not working right

I have a Ford F150 2000. My stereo's, factory model right speakers are not working correctly. It seems when I turn to the left I lose the sound and sometimes I get static, when I turn right it comes back for a bit. I have also adjusted the fade to the back right speaker and the same thing happens. Any input or suggestions would be greatly appreciated. Thanks.

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Bad connection probably, could be bad wire. the static is likely from connection breaking and remaking. Probably upstream (near amp)