2003 Ford Taurus SES stereo install?

I m trying to install an indash stereo with Bluetooth and such into my Taurus. I got the 18 foot long harness to run from the trunk to the dash but the harness only has 9 wires! (8 wires for all 4 speakers, and one wire to connect to an amp to control the amp) it doesn t have a power wire! What am I supposed to do? The stereo has a red wire to connect to constant 12v supply terminal and red to connect to terminal controlled by ignition switch but again, the wiring harness doesn t have those!

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