Driving your Ford truck with faulty turn signals is very dangerous as other drivers may not be aware that you are turning, resulting in an accident. Ford trucks comes in a variety of makes and models, but the troubleshooting process is the same with the only difference coming in the type of bulb your truck uses. Check your owner's guide to see what bulbs your turn signals use. The troubleshooting procedure takes only a few minutes, but it is very important.
Put on the gloves for safety reasons. Turn off the engine of your truck, and open the hood.
Unfasten the three screws on top of the headlamp. Lift the plastic tab on the headlamp unit in order to release the headlamp. Slide the headlamp unit away from the vehicle, and remove the snap fastener at the fender.
Lightly pull on the electrical wire from the rear of the headlamp unit. If it is loose, firmly plug it into the headlamp unit. If the turn signals still are not working, you may need to replace the turn signal bulb.
Remove the electrical wire from the headlamp unit. Rotate the turn signal bulb counterclockwise to remove it. The turn signal bulb is the smallest bulb on the headlamp unit. Pull it out of the vehicle, and install a replacement bulb. Most contemporary Ford trucks use 3157A-type bulb for the turn signals. Check with your owner's manual if you are unsure of the bulb you should use.
Reconnect the electrical wire to the headlamp unit. Place the unit back into the vehicle. Reinstall the three screws to the headlamp unit. Close the hood of the truck. If the turn signals still are not working, you may need to replace the fuse.
Open the driver's side door, and remove the cover from the fuse block. The fuse block is located under the steering wheel. A fuse puller and spare fuses are located under the fuse block cover.
Locate fuse "2" in the fuse block. The fuse labeled "2" is the turn signal fuse. Inspect the fuse to see if it is still functioning. The metal rod inside the fuse should be in one solid piece. If the rod is broken, the fuse will have to be replaced.
Use the fuse puller to remove the fuse and replace it with a spare 10A fuse from the underside of the fuse block cover. Reattach the cover to the fuse block. Close the door.
