Anyone know what this green wire does on the Y connector of a back

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5338 best r/carav images on Pholder Can someone please help me out? I just picked up this truck and everything work with the stereo but I'm getting no music out of

Check needed - Thermostat wiring. (G) Green wire in (O/B) slot? : r/hvacadvice

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5338 best r/carav images on Pholder Can someone please help me out? I just picked up this truck and everything work with the stereo but I'm getting no music out of