Check all your fuses first. The yellow wire behind the deck is for a constant 12 volts from the battery( to retain memory), the red wire is for switched power, for example when you turn the key it should be 12 volts, when you remove the key(or turn off) there should be no voltage on the red wire, and of course, make sure you have a good ground. Use a test light when performing these tests, it's a time saver.
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