I just got a 2000 F250 SD and have a few issues.

1. Horn doesn't work. When I press the horn button, I can hear and feel the relay clicking, but no horn. If I got hot wire the horn to the battery it works. So I'm thinking its an issue with the wiring between the relay and the horn. Instead of trying to track it down, is it easier to just run a new wire, if so does anyone know what wire on the back of the block is the one that goes to the horn?

2. Cruise control does not work, not even turn on. I know it may be the clockspring, but I also know there is a cutoff switch on the master cylinder that is cheaper and easier to get to, so I'm going to try replacing that first.

3, Previous owner discounted the 7 plug trailer connector at the gray plug and spliced in a 4 blade connector. I should be able to buy a new 7 plug and plug back into that gray connector, does anyone know the best place to get that cable/plug?

 

Here is a list of lights that come on when I turn the ignition on.

Seatbelt
Airbag
Battery
Oil
Temp
Low Fuel
Service Engine Soon
Door ajar
ABS
Highbeam

What doesn't come on;
Cruise
Brake

 

I tested the Yellow wire with green tracer from the back of the fuse box. No power when horn is pressed, but I can hear the relay clicking. So I switched it for one of the Power window relay, which works, but still no horn.

Would it be best to just tap off the wire coming from the column and add an inline relay?