No sound in the speakers

We'll need more info. Make and model of amp will help. To start, double-check all the connections such as 12V positive and ground, remote turn-on, RCA inputs or speaker-level inputs, and speaker output wiring. Use a test light or multimeter to make sure you're getting 12V to the power input and remote turn-on input. It can be helpful to have a known working amp to substitute and test things out that way. Run new temporary speaker wires to the speakers so you can rule out bad wiring.