Hadley Lighting - Exterior

Hadley: A Michigan Name in Air Horns Since 1945

Hadley is a Grandville, Michigan-based, privately held manufacturer founded in 1945. The company supplies components to the heavy truck, trailer, transit, motor coach and recreational vehicle markets. Its best-known products are air horns, but the catalog also includes height control valves, mirror systems and mini air compressors. The company's "Hadley Sound" is a recognizable part of the road.

The Hadley Sound

Hadley's Bully series is known for a clear, penetrating hi/lo tone that comes from a sound chamber and offset trumpets. Horns come in round or rectangular bell designs, in single or dual configurations, and in finishes such as matte black, chrome and anodized aluminum. Lines such as Ambassador and Bully are sold as complete kits or as individual parts, which suits both fleet technicians and DIY installers working on pickups, SUVs, RVs and boats.

Building a Complete Air Horn System

A good air horn setup is more than the horn itself. The core of the lineup is the Hadley air horns, from compact chrome Bully horns to long rectangular assemblies and musical multi-trumpet sets. Vehicles without an onboard air supply need a dedicated source, which is where a Hadley air horn compressor comes in. The 850 Series 12V mini compressors are designed for this job.

Compressed air has to be stored so the horn can deliver a strong blast on demand. A Hadley air horn tank serves as that reservoir. Control matters too. A Hadley air horn switch, such as a pressure switch, keeps the compressor cycling within a set pressure range so the system stays charged without running constantly.

Finally, secure installation protects your investment. Hadley air horn mounting hardware includes brackets, elbows, tension washers, pads and fitting components. Horns vibrate and face road debris, so solid mounting and quality fittings help prevent leaks and rattles.

What to Consider When Choosing

• Voltage: Match the compressor and any electric horns to your 12V or 24V system.
• Air source: Trucks with onboard air can use a solenoid or lanyard valve, while other vehicles need a compressor and tank.
• Horn style and size: Round and rectangular bells, single or dual, differ in length, tone and mounting needs.
• Fittings and tubing: Use compatible fittings and tubing for leak-free connections.

With decades of experience serving commercial vehicle builders and the aftermarket, Hadley remains a go-to name for anyone who wants their vehicle to be heard.