Use a volt meter to check the power going to the amp. without disconnecting the wires, put the leads on the + and - terminals. you should be getting at least 10V but hopefully closer to 14V.If not, check it is properly grounded and good connection at the battery. Next check the speakers. use an Ohm meter to check the Ohm load. disconnect from the amp and check they are not below 2 ohms (although 4 is better).
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