Are you sure that the terminal isn't shorted to the case of the amp?
If it's not, the amp probably has a shorted output transistor.
If you want to repair it yourself, read through the following page. It explains the basics. Let me know if you have any questions.
Basic car amp repair primer
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how would i fix it
when power is connected to the speaker wire it works fine and the protect light goes off why is that
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