1991 radio wiring question

[NCTyphoonKid]

Replacing the dash in my truck this evening and noticed this yellow and white wire with connector coming from the radio head unit. Does anyone know where it plugs in? I don’t recall unplugging it. This is the radio I have.

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[AK49BWL]

Supposed to go to the back of the 5 band equalizer on that style's tape deck - note that you have no EQ controls on the head.

 

[Steven Petersen]

Definitely the cassette/equalizer plugs.