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On an 80 model, should be in front between the headlight actuators..two if im not mistaken..I believe in 81 they swapped to the inside of each front fender...they also used a horn relay in 1980...if the horns aren't working, check the bolts, they are the ground for the horns...they also put like two things under the horns..act as insulator and contacts...if they are not in good shape horns wont work...if you open the hood and look just to the inner side of each headlight you should be able to see the horns.. bolts and pieces under horns very likely the problem...if its a late year production and they are inside the front of the fenders you have to pull the fenders and front clip piece..horn relay should be by fuse box..good luck!
open the hood, look straight down and you will see it in front of and to the right of the radiator, beneath the driver side head light assembly. Save your self some time, pull the two wire plug connector off and jump the horn directly to the battery with a jumper wire made from an old extension cord. If the horn honks, it is good, if not, go get a replacement at a junkyard and replace the it. Look in your owners manual for fuse panel locations, there is a small one under the hood and a larger one to the left of your passenger's knee under a velcro panel. The horn relay will be plugged into one or the other.
The horn is located behind the bumper cover, behind the grill. There should be a 20 amp horn fuse under hood in fuse box, and the horn relay is up under dash on the right side of instrument panel, unplug one of these, or both and the horn should stop beeping.
in the engine compartment, drivers side behind the battery in front of the around air filter, there is a fuse compartment. Its a mini fuse a #25 fuse. you have find the latch on the compartment to get it to open! According to the OWNERS MANUAL, fuse/relay #4 in the engine compartment fusebox covers the horns.
horn is only to be used to attrack attention of nice looking woman ,if the driver in front is asleep at the traffic lights or on the mobile and doesnt move off ten seconds before they change ,or attracting the attention of someone on the top floor of apartment building so you do not have to get out of vehicle and ring bell.-----right airbag removal ,disconnect battery then look under the steering wheel for air bag fitting retainer ,two types one is a sprung lever that has to be moved to one side and the other is a small bolt head with either a 8mm headaed bolt or a star drive .
There is the actual horn located in front of the radiator on the support.
I would also check the horn relay. You want to make sure that when depressing the horn button you are getting 12 volts to the horn, but it needs to go to the relay first.
I have a diagram for you :
2000 Ford Expedition Horn Relay Location
Please let me know how it goes.