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Things I've tried:
Testing wires from amp to plug inside the door, both fine.
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Testing wires from head unit to amp, both fine.
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Swapping the left and right outputs on the head unit, this played the sound from the left channel on the right speaker, but left door speaker did nothing.
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Another amp from eBay, this worked for all of 30 seconds and then the left channel stopped working again.
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Have I got really unlucky and bought another dud amp, or is there likely to be something causing them to blow?