How do you fix the horn on a 1994 F150?
The f150 is notorious for the clock spring inside the steering column going bad, it is a flat cable wound on a spool, located behind the airbag assy. It can also cause your cruise control to not operate..what happens is the flat cable gets a break in the cable due to age, and causes it to not make contact..this is a dealer part and can be purchased for around 75.00. hope this helps.
check your fuses for power, then check your horn for ground, have someone push on the horn and check for power if still not working check horn pad if worn out in column While the above is good general information, the 2 1994 Ford E-150's that I've had experience with have both experienced "clockspring" failures. All of the electrical devices on the steering wheel go through the clockspring, so a failed clockspring can take out…
Possible causes are a fulty horn relay, faulty horn switch (probably part of the steering wheel SRS module), or a short circuit between the horn relay & horn switch. Quickest temporary fix is to remove the horn relay, but as a horn is part of the required safety equipment on automobiles you need to find the source of the problem & fix it asap.