There is a loss of power from factory connector followed yellow in the stereo dash area, I’m not sure where to start? It does power the Sony in that, possibly other problems. Accessory has power and negative is fine. Fuse is replaced and fine. I bench tested the stereo which is fine too. There’s the issue with the picture below, this wire runs thru the firewall to near the fuse box area roughly… It was blown. New battery too. Any ideas?