2000 ford f250 with 7.3 diesel horn and cruise stopped working. Replaced clock spring wireing harness but cruise still not working

that harness is for your horn / cruise control and other controls if cut resplice

Was Cruise Control working before the New Horn was installed? The power supply to the Horn, (input to ground wire) is connected to the Cruise Control Module (CCM). This CCM is wired to the Relay Switch Box located in the Engine Bay. The Relay Box cover will have a Chart indicating what function each Relay coresponds to. Your local autoparts store (AutoZone) can test the Relay Switch, and you'll know (if any Relay) need to be replaced.

The CCM is also wired to the Steering Wheel, but first passes through the Clock Spring Coil, located just behind the Steering Wheel. The Clock Spring allowes for the Function Buttons on the Steering Wheel to have power while Steering Wheel spins.

The Clock Spring can malfunction or break, its rare, but this will cut power to the Function Buttons on Steering Wheel. If ALL the buttons on Steering Wheel dont work, then the Clock Spring is the Culprit. The Coil may need to be replaced.

The Cruise Control Module itself may have failed and also would cause a few or all Steering Wheel Functions to quit working.

But first check the Relay Switch Box and examine the Harness Cables connecting (Steering Wheel--to--CCM--to--Relay Switch Box--to--Battery Supply).

Also if Cruise Control was working before the new Horn was installed and now not working, then most likely the Problem is a bad wire connection somewhere and/or is a faulty Relay.

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The horn switch and the air bag and cruise control wiring in the steering wheel go through the clock spring, ford calls it air bag sliding contact. The clock springs have been know to go bad.

Steering Column Airbag Clockspring Repair Ford Superduty 1999 Up

check the wire harness on the cruise servo under hood for corrosion

Just because the cruise and the horn are operative does not mean the clock spring is good check the clock spring there is most likly an open in the clock spring.
Tommy

There is a wire harness in the steering column called a CLOCK SPRING. Replace it.

most likely the clock spring needs to be replaced which is located in the steering column.

Have someone check the clock spring. Both of these run thru the clock spring wires.

clock spring in the steering column is my guess. They are delicate and have to do with anything in the steering wheel like airbag, horn, or anything that is operated by buttons on the wheel. These wires have to turn constantly with the steering wheel and the "clock spring" goes bad often enough

the most common cause is the steering wheel rotating contact, it is called the clock-spring contact, this allows the wheel to turn and still have contact with cruise (if eqiped) horn and airbag, all have separate wires on a coiled printed circuit that looks like a clock-spring.