GMC Troubleshooting Questions? Ask a Mechanic for Answers
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The problem may be due to the horn bad and or the slip ring is failing. I would start with grounding the black wire from the horn switch at the horn pad to the horn relay and see if the horn will sound. If it dose then this usually means the horn pad is bad. I have enclosed the steps to remove the pad as well as the wiring diagram in the link below for testing reference. Have a look and see if this will help you determine the cause.https://dl.dropboxusercontent.com/u/104923897/Horn%20pad%20Sept%2015.pdfhttps://dl.dropboxusercontent.com/u/104923897/Horn%20wiring%20Sept%2015.pdf