[Texas63GMC]

I am having the same problem. I'd like to know if the GMC horn button works the same as the chevy horn in this site.... http://www.64moneypit.pages.qpg.com/...cks/id108.html
my horn didn't have the plastic insulator disc/spacer between the horn ring and disc. It probably had it at one time. These parts are available

http://www.truckandcarshop.com/trucks60_72/t60_058.html