What's the 16 pin for in a Gen 2 ST?

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americandan

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I put in an Atoto head unit and I wired up only one side of the two plugs which is pretty normal for all the speakers to work. I can't help notice that I have another harness just sitting there not doing anything. What is that 16 pin for? Thank you.

By the way since I don't have an amp in my truck can I directly wire the speaker to the harness in the back of the bigger plug? I'm still trying to figure out why I have no audio regardless of which head unit I put in and I do not have an amp in this sport Trac. Thanks again!
 

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