if its just happened after changing the wheel, id imagine its the column pin thats earthing possibly.
you see the little brass pin sticking out of the end of the column.
that pin contacts the circular metal ring on the back of the steering wheel, which sends power to the horn switch.
check that pin hasnt been knocked downwards, or the wires come off the back of it.
Hi did we find out why the horn was staying on because my horn is doing the same thing
i had it a couple weeks ago too, the brass ring at the back of the steering wheel came loose.
the plastic lugs that set it into the wheel got brittle and snapped, causing it to pull away from the wheel, which isnt a problem untill you turn the wheel, then the positive wire gets yanked round with it, and gets pinched and exposes the inner wire.
as its surrounded everywhere by earth points, it cant help short, triggering the horn non-stop.
the horn randomly blasting out through a quiet neighbourhood at 1am was a bit unexpected for me.
had to switch car off and pull the fuse out to get it to shutup.
pulling the fuse is a quick easy fix, when your in a pinch, but watch out, as i think the rad fan is on the same circuit.
i have same problem !!
and i had the same the horn blasting through neibourhood at all hours..
only thing is i cannot get my wheel off. its rock solid. anyone got any handy tips?
Undo the centre nut a few turns, (just enough to cover up any exposed threads), raise your legs under the steering wheels just so you put pressure on from below and gently hammer away at the centre nut. The steering wheel should come loose - if you're lucky. If this fails, get a puller.
One day I'll start a build thread. One day...