Some amps go into protect mode if they get too hot, which can prevent a permanent failure. The common cause of overheating is a lack of airflow. If the amp is located underneath the seats, or in another confined space, that may cause it to overheat.
How do I reset my amp?
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Can a bad ground cause an amp to go into protect mode?
Why is my amp not putting out sound?
Possible causes include: The speaker is completely blown. The output transformer is open or otherwise faulty. The speaker jack is not wired correctly.