Check the turn signal relay under the dash. As a check, turn on your hazard (emergency) blinkers. The turn signals lights should all start blinking. These use a different relay and says the lights are okay. If this works, follow the relay clicking noise. The two relays are next to each other.
I have a 97 f150 and the blinkers did not work. They would always work for the mechanic....go figure. We finally figured out that I put the tilt steering down which separated the switch in the column...when the steering wheel was up for mechanic they would always work.
You may want to check the fuses. If the truck is 4x4, there is a 4x4 differential fuse that also controls the turn signals. I had the same problem with a 98 F150, signal lights would not work, but the hazard lights would. The 4x4 light comes on but the front axles wouldn't engage.
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How Turn Signals Work
by Karim Nice The Thermal Flasher This small, cylindrical device is sometimes located in the fuse panel under the dashboard of the car. It costs about $3 in the auto parts store and works reliably for years.
Copy & Paste Link below for more info, and pictures
auto.howstuffworks.com/turn-signal2.htm
The head gasket is about to blow.....Typical ford..
most likely would be a bad turn signal flasher
The computer that controls the component cannot do what it wants to do so it signals you to give it attention get it diagnosied by an ASE trained experianced tech
Is the 1997 F150 Transmission is the same as the 1999 Expedition
vacuum leaks
emergency blinker
No, 97-03 F150's have a 5x135 lug pattern.
The ABS computer has detected a fault in the Antilock Braking System. Often it is a wheel speed detector or a modulator.
To remove the fan shroud from the 1999 Ford F150 you need a user manual to guide you.
yes
Check ground on that fixture short in the wiring it sounds like
The speed sensor is mounted in the top of the rear differential on a 1999 F150. Remove the wires, then unbolt the sensor to remove it.