If I read your question right, you have an after market radio to install. The radio should have wiring diagrams to help out. Generally, Red is positive and Black is negative for 12 volt power, use a meter to verify polarity. The Yellow wire is connected to positive (you can connect it with the Red wire). Fading is used to change the balance between front and rear speakers, if you only have one set then use the wires from the harness to connect them. For good sound quality, make sure that left negative goes to the negative wire of the speaker, left positive goes to the positive wire of the speaker. The Orange wire should connect with the dash board lights so that the radio illuminates when the dashboard is illuminated, it can be connected with the Red wire if you want the radio to illuminate all the time.
You can make the wiring easy if you buy some automotive splice connectors (usually blue plastic, allows one wire to pass through and the other wire end gets connected by a metal blade that cuts through the insulation and grips the wire itself.
The hardest part of replacing a radio with a non OEM radio is getting the unit to fit snugly in place.
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