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Hello, Most of the fuses service more than one thing. The number 1 fuse on the side panel of the dash is for the Hazard Flashers, Stop Lamps, Indicator lamps, Speed Control, and Brake Shift Interlock. 93-2000 models but may be the same because Ford likes to keep things the same or very close to the same. It should be a 15Amp fuse. Hope this helps. You may also look in your owner's manual.
disconnect the horn or horns, operate the horn and see if the fuse still blows. if the fuse still blows then there is most likely a short in the wiring. relays rarely cause shorts. if the fuse doesnt blow with the horn disconnected, reconnect the horn and operate the horn again, if the fuse blows you have a shorted horn.
If this is a new body style 2004, check the shift interlock fuse, cab fuse panel F16. If the fuse tests good with a meter to both sides ( to ground when pressed down power should be there ) check both the Tan w/ REd stripe wire and the pink w/ light green stripe wire , it would be a case of needing a new shift interlock solenoid.
If this is an old body style truck, check the stop lamp / brake light fuse. The shift interlock uses the same fuse for both.
If you replaced the tail lamps with LEDs in either 2004 version, and did not use load resistors, this could be the source of your problem ( truck thinks the brake lamps are out ). You would need to install load resistors on them.
If you mean the shifter will not move then you have a shift interlock problem. If your brake lights do not go on then check the fuse for brakes. Google "shift interlock" for your particular truck as there are many fault possibilities. brake light switch, neutral safety switch, lock solenoid, connections, etc.
CHECK BRAKE LIGHTS FUSE.IF FUSE OKAY.BRAKE LIGHT SWITCH IS BAD.VECHICLE NOT SHIFTING OUT OF PARK PROBLEM COULD BE BLOWED FUSE OR CLUTCH PEDAL SWITCH FOR MANUAL TRANSMISSION OR TRANSMISSION RANGE SENSOR FAULTY AND PROBLEM IN BRAKE LIGHT SWITCH IF FAULTY IT WILL KEEP THE BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID FROM WORKING KEEPING YOU FROM GETTING VECHICLE OUT OF PARK.IF BRAKE SWITCH IS GOOD.PROBLEM IN THE BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID.