...drawing click...

Since your going 12 volt you may want to add a relay
...12 volt horn relay...

Daveydo has a good drawing if you do not use a relay
Originally Posted by Davey Do
Thanks for the diagram, Joe.

I added to the previous illustration with a question, incorporating an excerpt from your diagram: Specifically, is the circuit completed at the point where the end of the spring meets the edge of the steering wheel mast?

http://s837.photobucket.com/user/da...amp;_suid=141741642445708749389373850446

Not sure what style horn you have, some if this info could change depending on your horn.

DADS50
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1950 chevy 3100