What does this plug do?!?

SkittleTits

New Member
Jul 26, 2010
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1
Hey guys, I am not sure what this extra plug is? Car is a 92 Mustang LX 5.0. No idea if it had premium sound or a factory amp. I installed a wiring harness for the black plug and gray plug but I do not get any sound. What do I have to do to make this work? Thanks!
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