If your car used to be a Police Car, it is likely the horns were disconnected and/or removed. The horns on most emergency vehicles are wired into the siren. When the horn button is pressed, the siren stops and you hear a loud electronic horn. When the horn is released, the siren starts back automatically. My 97 Interceptor has the same problem. If I can fix mine, I'll post repair instructions here.
I fixed mine on an '03 Interceptor... I wired a relay that sends hot to the factory horns (which were still there, just cut). If you remove the panel under the dash you can find the wires that control the horn. Using your multimeter, see which one gives a ground when the horn is pressed, then connect that to your relay.
I have a 90 crown vic. Send me a email address. Mine is irishone_oneirish@yahoo.com
On a 2006 Ford Crown Victoria, the horn is typically located in the front of the vehicle, behind the front grille. It is mounted on the driver's side, often near the radiator support. To access it, you may need to remove the grille or other components, depending on the vehicle's configuration.
The most common horn problems are either a blown fuse or a bad horn relay. Both should be located under the hood in the fuse box.
the fuse amp for a lighter is a 20amp.it controls the lighter,horn & cruise control
On a 1989 Ford Crown Victoria, the horn is typically located in the front of the vehicle, near the radiator support. It is mounted on the driver's side, often behind the grille. To access it, you may need to remove the grille or the front fascia, depending on the specific model and configuration.
The horn relay for a "96 Crown Victoria (police model) is located on the right fender where the fuse/relay box is.....3rd relay in from the right. If you are on the right side of the car.....3rd one towards the engine.
I believe the horn is mounted below the battery tray
behind the front bumper
On a 2003 Ford Crown Victoria, the horn fuse is located in the fuse panel under the dashboard on the driver's side. To access it, remove the cover of the fuse panel and locate the fuse labeled "HORN" or a similar designation. If the fuse is blown, replacing it with a new fuse of the same amperage should restore the horn's functionality. Always consult the owner's manual for specific fuse locations and ratings.
Most likely a short in the wire contact at the steering wheel. Look there.
on the steering wheel
Front drivers side. Mounted on the metal bumper, behind the bumper cover, towards the right front tire. Look under the front end, look up and you'll see it.