In this video I show how to quickly diagnose a horn issue on a 2005 6.0 gmc Savana! There are other diagnosis that will narrow it down more if this doesn't work but 99% of the time it will come down to something in this video! #gmc #savana #horn #nohorn #diagnosis #fixing #automotive #fuses #relays #airbags #airbag #chevrolet #silverado #express #beep #screwdriver #issues #tips #tricks #technician #auto #truck #car #6.0