When i switch the car on the amp red light comes on
It could be a power fault (polarity is crossed), thermal fault (amplifier is too hot), subwoofer fault (subwoofer is blow or impedance is too low (ohms)), or either the amp has been ran too hard, meaning you played it till it went into themal, turned it off, and turned it back on to reset it, didnt allow it the time it needed to cool off, and continued to play it. If you did that, its hard faulted, and you need to repair or replace it.
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