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Jeff Hens

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  1. Jeff Hens
    i am changing radios out of my 2018 Colorado and can't find out what each of the ports on the receiver are for. The one i'm interested in (I took this from another persons post so they had other units i'm not interested in) is the 8427-8525 receiver. The adapter control unit i got from Crutchfields plugged into the large green and grey ports on the one side and the antennae was obvious but... there were wires going to the smaller brown and grey ports on the right and a plug going into the yellow round port as well. Does anyone have a schematic for this or know what these ports are for?
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