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Usually the yellow wire on a wire harness is a constant wire (memory) wire. It's what keeps your presets, preset. The red wire is the power wire. If you have the RED wire on the headunit's harness connected to the Yellow wire on the aftermarket wiring harness, you'll keep your headunit powered on at all times. I don't know, so I won't venture to say it will cause your battery to die, but it's only logical. Match the red wire on the headunit, to the red wire on the harness, and same for the yellow wires. Also, one way to check if it's wired incorrectly is if your presets don't stay the same and your cd player doesn't pick up from the last point it was before you stopped it (ie: cd starts from the beginning instead of track it was last on)
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