I have a 2016 Fleetwood Excursion 36K and the outside radio has become inoperative, it won’t power up.  I believe that I have a blown 12v fuse somewhere, but cannot find it.

1. Issue: Boss BV6652 radio, in the outside entertainment center, wouldn’t power up.
2. Pulled the radio out from its mount and saw ‘green’ corrosion on the wiring harness where it plugged into the radio.  I did not see any evidence of water or moisture behind the radio.
3. Checked the in-line fuses for the red and yellow power lines, both fuses were good.
4. This model Boss radio is discontinued by Boss, but found a refurbished model on Ebay.  Installed the radio and wiring harness, the new radio would not power up either.
5. Use the electric tester and found the red wire to be powered, but the yellow wire, labeled battery, had no power.  Picture attached.
6. Traced the yellow wire back and found the attached wiring harness (picture attached).  Tested this wiring harness and found the red/gray wire to also be dead, picture attached.
7. I have concluded that there may be a 12v fuse for this radio somewhere in the coach that is blown, possibly as a result of the corrosion on the back of the radio.
8. I have some of the wiring diagrams (cannot find the sheet that depicts the outside entertainment center, also attached) for the coach, but cannot find the fuse for this circuit.