Jim Lee,
As AD_Pickup pointed out several days ago, '53 was the first year for the horn relay on these trucks.
One terminal on your horn would support this statement.
When you indicate you have a wire coming out of your steering column, I assume you mean a 'factory' wire exiting near the steering box proper. This isn't to be confused with something taped to the outer column, or obviously stuck on by the previous owner.
The fact that another button was installed might mean the factory one doesn't work, or is grounded all the time.
This wire (factory) needs to be tested to make sure it ISN'T grounded until you toot the horn.
A ohm meter could do this task.
If the wire is good, it needs to be attached to a horn relay, which as Tiny indicates, operates a normally open contact which can pass a higher current to the horn for a nice loud blast.
This post is reading like the old testament...check out your 'factory' wire, and maybe even pull the wheel to investigate the little contact. If all is well, someone will fill in the remaining wiring details.
I think a factory horn relay might be located on the firewall, above the steering box, in the corner. If your truck has been converted to 12 volts, this may be the reason for the aftermarket button.
Stuart
