When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Like Poison said, you can poke around for a hot switched circuit like wipers or heater or whatever and you will get power to make your machine work. That is the Toothless Jake approach.
Better, find out where the ACC point off the ignition switch is, tap in, put in the proper fuse to supply your machine, and away you go.
The problem with tapping into any hot switched wire is that you may overload the fuse that is designed for only for the fed appliance, like lights or heater. You must be aware of the current draw of the CD player that you are installing. Otherwise, blown fuses.
Poke around with a voltmeter as Poison says, and report back. We will help you.