[ray_mcavoy]

Welcome!

The horn issue sounds like a short to ground somewhere in the black wire that connects the horn button to the horn relay. The horn button normally grounds that wire to complete the circuit to ground and energize the horn relay. So if that wire is shorted to ground anywhere along the way it'll keep the horn blowing all the time.

Since pulling the steering column to the side makes it stop, I would recommend that you start looking in that area. Check to see if that black wire accidentally got pinched somewhere (such as between the column & dash).


The tail lights, brake lights, and turn signals are probably an unrelated issue. The first thing to check there would be the grounds at the light sockets.

Tail light grounds are a very common problem on these trucks because the stock configuration relied upon the metal tail light housings to provide the ground. That in turn requires the housings to make good electrical contact with the truck bed, the bed to make good electrical contact with the frame, and finally the frame to have a good ground connection to the negative battery terminal. Paint build-up, rust, and corrosion at the contact points between those various parts often leads to poor grounds at the tail lights. Many folks have chosen to run dedicated ground wires directly from the light housings to the frame to ensure good grounds.