The horn works when the horn button grounds the wire going to the steering
wheel.

Is it necessarily the keys doing it or if you grab the
lock cylinder and move it, it will trigger the horn?� If you grab the
steering wheel and rock it side to side or in and out does it honk?

I would check for the following:
- is the allen bolt that
holds the lock cylinder in place right
- remove the steering wheel
and see how worn the brass tab is that controls the horn - sometimes these
are tweaked and the slightly wrong movement of the steering wheel is
enough to ground it.

David Marshall
VW Adventure Driver
and BMW Adventure Rider
 
http://www.hasenwerk.ca

On
Fri, February 27, 2009 07:43, Rocket J Squirrel wrote:
> 
> Howdy all, popping my head up to ask a question here.
> 
> When it gets cold, say freezing or under, the horn honks when I
jiggle
> the key. What's the physical relationship between the
horn wiring and
> the ignition lock? And why doesn't this happen
when things are warmer?
> 
> --
> Mike
"Rocket J Squirrel" Elliott
> 84 Westfalia: Mellow
Yellow ("The Electrical Banana")
> 74 Utility Trailer.
Ladybug Trailer, Inc., San Juan Capistrano
> Bend, OR
>
KG6RCR
>