Speed warning light flashing on 88 ford Thunderbirdlx

Is this one of the 3 lights in the lowest corner of the display? These 3 lights are for the 3 following functions.
-(Top lamp). Speed limiter Light.
-(Bottom left lamp). Trans Axle warning light.
-(Bottom right lamp). Oil Pressure Warning light.
This sounds like it could be the speed limiter. Check for any switches on the dashboard and the steering column for switches with the same logo as the speed limiter light as this can flash to show it is active.
The Trans Axle warning is the systems electronics showing there is a possible issue with the transmission.
The Oil Pressure light shows there is an issue with the oil system such as low oil or low oil pressure in the engine.
You will often find the Trans axle and Oil warning lights usually don't flash.
Try this website for an owners manual for your vehicle.

https://www.manualslib.com/manual/53030/Ford-2005-Freestar.html?page=10#manual

Not surprisingly, many others have experienced problems with the ignition switch on this car. Historically, it is not a sound, but that the key is stuck in the ignition. http://repairpal.com/key-will-not-come-out-of-ignition-570 Your problem sounds different, but it may be related. Although I do not recommend the fix in the link above, it is possible the previous owner of your car did perform this fix and it has resulted in the problem you now have. My better guess is that the chime/buzzer has failed due to moisture or dirt and is no longer producing the sound that it should, but instead is altered to the ringing you describe.To disable follow these instructions:

1. Turn the ignition switch to the RUN (or ON) position. (DO NOT
START THE ENGINE)
2. Wait until the safety belt warning light turns off. (Approximately 1
minute)
Step 3 must be completed within 50 seconds after the safety belt
warning light turns off.
3. For the seating position being disabled, at a moderate speed, buckle
then unbuckle the safety belt 9 times, ending in the unbuckled state.
(Step 3 must be completed within 50 seconds after the safety belt
warning light turns off.)
After Step 3, the safety belt warning light will be turned on for three
seconds.
4. Within 10 seconds of the light turning on, at a moderate speed, buckle
then unbuckle the safety belt.
This will disable the BeltMinder feature for that seating position if it
is currently enabled. As confirmation, the safety belt warning light will
flash 4 times per second for 3 seconds.
This will enable the BeltMinder feature for that seating position if it
is currently disabled. As confirmation, the safety belt warning light will
flash 4 times per second for 3 seconds, followed by 3 seconds with the
light off, then followed by the safety belt warning light flashing 4 times
per second for 3 seconds again.
I hope this helps. Good luck.

The fuse panel is located underneath the dash, to the left of the steering column, next to the emergency brake pedal. You need to remove the under-dash insulation to access some parts of the fuse panel.


If it doesn't have a diagram inside the box, here's one I found online: http://www.coolcats.net/tech/reference/images/fusepanel.jpg


1 15A Lt. Blue Stop Lamps, Hazard Warning Lamps, Speed Control, Cornering Lamp Relays 2 6A - CB - Windshield Wiper/Washer Pump 3

Spare - Not Used 4 15A Lt. Blue Taillamps, Parking Lamps, Side Marker Lamps, Instrument Cluster Illumination, License Lamps, A/C and Heater Illumination, Radio Illumination, Digital Clock Illumination, Autolamp Relay 5 15A Lt. Blue Turn Signal Lamps, Electronic Day/Night Mirror, Lighted Vanity Mirrors *, Backup Lamps, Illuminated Entry, Keyless Entry, Cornering Lamps 6 20A Yellow Rear Defrost Timer, Chime, Back-Up Lamps, Cornering Lamps, Rear Reading Lamps, Trunklid Release, Digital Clock Display, Illuminated Entry, Anti-Theft Module, Turbo Buzzer 7 15A Lt. Blue Fog Lamps (Turbo Only) 8 15A Lt. Blue Courtesy Lamps, Key Warning Buzzer, Illuminated Entry Module, Glove Box Lamp, Door Lock Relays, Radio Memory, Cluster Memory, Outside Mirrors, Tripminder Module, Analog Clock, Anti-Theft Relay 9 30A Lt. Green A/C Heater Blower Motor 10 20A - CB - Horn, Cigar Lighter, Fuel Filler Door, Flash-to-Pass, Speed Control 11 20A Yellow Radio, Tape Player, Premium Sound Amp, Power Antenna, Graphic Equalizer 12 20A - CB - Power Seats, Power Locks, Keyless Entry 13 5A Tan Instrument Cluster Illumination, Radio, Climate Control 14 20A - CB - Power Windows, Power Moonroof 15 10A Red Taillamps, Rear Side Markers, License Lamps, Electoluminescent Coach Lamps 16 4A Yellow Electronic ATC 17 15A Lt. Blue Electronic Cluster, Tripminder Display, Fuel Gauge (non-electronic cluster), A/C Clutch, Speed Control Module, Graphic Warning Display Module, Electronic Blower Speed Controller 18 10A Red Warning Indicator Lamps, Autolamp System, Throttle Position Sensor, Low Fuel Module, Dual Timer Chime, Tachometer, Washer Fluid Level Indicator

i have a funny feeling it may be a speed warning light that has been fitted to keep the driver under the speed limit ?? sounds silly i know but ?? seen it done on company cars before now

check your head light relay

try the air filter first and the intake.the spark plugs then and after all go to a garage for checking compression timing and the head gasket.

your problem could be a damaged wheel speed sensor or wiring to the sensors.
or it could be a damaged abs ring

Fast flashing is a warning that one of the bulbs is not working. if the front flasher d/side is out try changing the bulb and cleaning the terminals inside the unit.

Common fault on FORD
Usually due to a poor connection in the YELLOW PLASTIC CONNECTOR underneath the passenger seat.


Just push it together properly and it should clear the AirBag fault

Check your brake light switch. If your car has cruse control, set it at a safe speed and step lightly on the brake pedal and release. If it doesnt disengage then brake light switch is bad.