Bose stereo and A/C inoperable

Bose stereo will not come on no lights or sound display screen is blank. Also the A/C system not working the HVAC blower will come on high by itself after vehicle has been running for a minute or two.Checked all fuses in cab and under hood found 15 amp audio blown under hood next to battery, it would blow every time it was replaced. I traced the yellow wire then I asked silver tracer from the fuse box to the firewall and inside the cab to a connector next to the brake pedal where it remained yellow but the tracers color on wire turned to pink unplug the connector harness and traced the Wire back to the under hood fuse box found it good. Are there trace the other wire Bromley connector to the back of the stereo unit apparently this is one of the main voltage wires to the stereo unit. I ran a new wire probably connector to the back of the stereo unit and it did not open the circuit and blow a fuse after I run a new wire but the unit still does not power up. I was wondering should I dissect the wiring harness that the yellow wire was in to see if it has caused further damage that I cannot see like I said I just ran a new wire on the outside of the wiring harness. After several attempts to talk to someone at Bo's about troubleshooting that suggested that the stereo unit was bad so we purchased one the complete units with the CD the face plate and the AC amplifier and the display replaced the whole unit and it is still doing the same thing as before. Any and all troubleshooting help and advice would be gratefully appreciated. Thank you in advance for your time.
Alan K.