Hello, I have a 98 Mustang with the mach 460 sound systems. After the installation with my kenwood KMM Stereo, and Metra 70-5510 kit, my speakers on the left haven’t worked, both front and rear driver side. I hear slight buzzing on the left speakers but that’s it, everything else seems to work perfectly. My only guess would be that the rca cables for the left speakers are defective.