Standard Ignition HR-125 Horn Relay

Horn Relay for Classic GM Applications

Standard Ignition HR-125 is a 12-volt horn relay built for select classic Chevrolet and GMC applications from the 1960s. It uses a rectangular connector, 4 male terminals, and a mounting bracket for a direct-style electrical service replacement.

With a 20 amp amperage rating and screw/blade terminal design, this relay supports dependable horn circuit operation in vehicles such as the Chevrolet C10 Suburban, El Camino, Corvette, and Pontiac GTO.

Key Features

• 12-volt horn relay for automotive electrical repair
• 20 amp amperage rating
• Rectangular connector shape
• 4 male terminals with screw and blade terminal types
• Mounting bracket(s) included
• Standard Ignition HR-125 part number

Application Details

Standard Ignition HR-125 is built for horn circuit service on select 1963-1967 Chevrolet, GMC, and Pontiac vehicles. It is listed for 1967 Chevrolet C10 Suburban, C20 Suburban, El Camino, K10 Suburban, and K20 Suburban models equipped with Canada Emissions, plus 1967 GMC G15/G1500 Van and G25/G2500 Van with 2 mounting screws and 2 blade terminals. Additional coverage includes 1963-1966 GMC G1000 Series, 1963-1965 Chevrolet Corvette, 1964-1965 Chevrolet El Camino with alternator, and 1963-1964 Chevrolet Bel Air and Impala. Pontiac coverage includes 1964-1965 Acadian, Bonneville, Catalina, Grand Prix, GTO, Laurentian, LeMans, Parisienne, and 1964 Tempest, plus 1965 Tempest with Canada Emissions.

This part cross-references Bosch 16129 for the same application.

What It Helps Fix

• No horn operation when the relay has failed
• Intermittent horn function caused by worn relay contacts
• Electrical switching issues in the horn circuit
• Heat-related relay problems under the hood
• Fitment issues when replacing an original-style horn relay

Installation Notes and Tips

Verify the connector shape, terminal count, and mounting style before installation. HR-125 uses a 12-volt system, 4 male terminals, and screw/blade terminals, so matching the original relay layout is important for proper horn circuit operation. Confirm vehicle-specific notes such as Canada Emissions, alternator-equipped El Camino applications, and the GMC van mounting screw requirement before ordering.

Quality Assurance

Standard Ignition builds this relay with composite housings to help protect against harsh temperatures and severe under-hood conditions. Where specified, brass or copper contacts are used for wear resistance, and manufacturing follows TS16949 and ISO9001 quality systems for consistent OE-style production control. Part number HR-125 is produced under strict quality requirements for the listed Chevrolet, GMC, and Pontiac applications.