Hi,
I attached the entire wiring schematic for the Bose system. First, check the fuses I highlighted. Next, make sure the grounds are good for both the receiver and the amp. They are both located in the same place, center under the dash. I highlighted them as well.
The schematics below were cut in half to make them more readable. I did overlap them so you can follow them easier.
Here is a link that you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
When checking fuses, confirm there is power to and from the fuse.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Let me know what you find or if you have other questions.
Take care and God Bless,
Joe
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Friday, March 12th, 2021 AT 9:11 PM