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Is there anything else around that turned off when the door is opened that you can wire off of or use it to trigger a relay?
Another solution would be to find the wiring diagram for your stereo and tap into the amp remote wire from your head unit. Check the12volt.com or purchase a service manual too find a wiring diagram. If you buy a service manual, i suggest eBay. Of course you can figure out which wire is the remote wire with a multimeter, but it's just so much easier to know beforehand.
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