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Aftermarket HU wiring, help me identify these wires?


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Cutlass has a Alpine HU installed, and the installation job is the worst I have ever seen. And since I'm not familiar at all with these cars and their wiring schematics I need some help.

 

On the harness adapter I would expect all wires to go through the harness but 1-wire does not. The Yellow accessory wire which turns the HU on is routed outside of the harness. Is this normal?

 

4-wires are not used on the factory harness, well make that 3 now that I finally got the power antenna figured out but I just threw it on the accessory wire as I could not find the true power antennae switch.

 

Any links to some wiring diagrams or helpful hints would be great.

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