The horn is located behind the left headlight. Remove the headlight pins, and then the headlight. You should be able to spot it then.
The 2006 GMC Sierra-1500 has 12 valves.
The 2006 GMC Sierra-2500HD has 16 valves.
The 2006 GMC Sierra-2500HD has a V8 engine.
The 2006 GMC Sierra-2500HD has a 5-speed manual.
The 2006 GMC Sierra-2500HD is a gas-powered vehicle.
The 2006 GMC Sierra-1500 is a gas-powered vehicle.
The 2006 GMC Sierra-2500HD has overhead valves (OHV).
The 2006 GMC Sierra-1500 has a 5-speed manual.
The 2006 GMC Sierra-1500 has overhead valves (OHV).
The horn relay on the 1993 GMC Sierra is located on the fuse box. The horn relay is a rectangular shaped plug next to two larger round plugs.
The 2006 GMC Sierra-2500HD's turning circle is 43.8 ft..
The height of the 2006 GMC Sierra-2500HD is 6 ft. 4.2 in. (76.2 in.).