You can find the wiring diagram for a relay position for a 1997 Mercury Sable in the owner's manual. You can also check local auto stores.
Start with the headlamp switch.
You can find a power steering diagram for a 1999 Mercury Sable in the owner's manual. You can also find it at certain auto part stores.
the owners manual
In the Haynes workshop manual.
Go to the dealer service dept and ask for them to photocopy it out of their EVTM(Electrical Vacuum Troubleshooting Manual) for you. Any Ford or Mercury dealership will have that information on hand.
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In the Haynes workshop manual
cupter sateing vara
Click the link for a diagram.
In the back of the engine.
Should be firewall area by booster.
No color diagrams, but a really good "colorful" description of the radio/stereo wiring connections.See "Related Questions" below, which include wiring connections and a detailed procedure for installing a new stereo.