That is possible.
worn ignition switch
Short to ground or overloaded circuit
Usually the horn and cruise control go together because of the clock spring. It needs to be replaced and there is a recall for it.
Take it to a repair shop because the clock spring below the airbag in the steering wheel is probably defective.
cause of excessive blow- by
Depending on what engine is in the vehicle, it may not have a distributor. If the engine is the 5.7L it does have a distributor. If you have the 4.8L or the 5.3L these engines do not have distributors.
Driving like an absolute doughnut would cause that. Or not checking and toping up with oil and coolant.
Yes it can cause bulbs to blow.
Under the horn pad there is a clock spring. That is what normally fails. If your horn does not blow then that is the problem. It would be adviseable to pay a repair shop to make the repair.
Probably a short in the horn wire.
No, it is not a problem with a fuse. May be a bad relay, or horn switch.
I have seen on another message board that the fix caused some trucks to blow a fuse, easy enough to check and replace. However it is more likely that the clock spring in the stearing wheel is bad. Does your horn work? How about the cruise control? If they are on the steering wheel they won't be working either as the clock spring controls them all.