installer.com
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.
A grand marquis wiring diagram can be found in a Chiltons or Haynes auto repair manual.
The stereo wiring diagram for a 1988 Mercury Grand Marquis is available from a factory service repair manual. These manuals can be found online and PDF. format.
need wiring diagram for radiator fan control
autozone.com
www.modifiedlife.com
find a chilton manual, they are cheap
NEED COLOR CODE FOR RADIO SPEAKER WIRE 93 MERCURY
autozone.com has repair resources including wiring diagrams.
at the junk yard
dash lights don't work, but the fues is good.