Radio amplifier location

I suspect if you are looking for the location that the amp is not working. Before you replace it, I would suggest checking power coming into the amp first.

I have seen many amp failures because of a fuse so just check for power and ground before you replace it.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-wiring

Below you will find the process from the manual and wiring diagrams on the amp.

Please let us know what you find with this. Thanks