Audio Systems: radio installation, stock unit, radio installation

Question
how do i install a cd/dvd player in a 1997 ford expedition

Answer
The following 8 page document should give you all the ideas you will need.  Especially important are the wiring colors and plug compatibles (with the wiring harness you will need to purchase) and the tools to remove the stock unit.

http://installdr.com/InstallDocs/FLM/PDF/356033.pdf

Let me know if you need more.

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