WAI 7287-9N Alternator

120-Amp Alternator for Delco Applications

The WAI 7287-9N is a 120-amp alternator built for older Chevrolet and GMC truck and SUV platforms that need dependable charging output. It is a 100% new unit, not remanufactured, and uses proprietary components and manufacturing processes to support long service life and consistent electrical performance.

Key Features

• 120-amp amperage rating for higher electrical demand
• 100% new alternator construction
• Internal regulator type
• External fan design
• Clockwise (right) rotation
• Includes pulley
• 1-groove V-belt pulley
• Delco family application

Detailed Product Overview

Built for charging-system service on classic GM platforms, this WAI alternator is specified for 12-volt electrical systems and uses an internal regulator for simplified operation. The Delco-style design, external fan, and included V-belt pulley make it a direct-match solution for vehicles that require a 120-amp output with clockwise rotation. The 7287-9N part number is a useful reference when verifying the correct charging component for Chevrolet C10, K10, K20, K30, K5 Blazer, P20, P30, and GMC C1500, K1500, K2500, K3500, Jimmy, P2500, and P3500 applications.

This part cross-references BBB Industries 7287-9 and 7290-9 for the same application.

Vehicle Fitment

• Fits 1985-1990 Chevrolet P30, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1985-1990 GMC P3500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1985-1989 Chevrolet P20, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1985-1989 GMC P2500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet C10, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet C10 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet C20, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet C20 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet C30, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet K10, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet K10 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet K20, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet K20 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet K30, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 Chevrolet K5 Blazer, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC C1500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC C1500 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC C2500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC C2500 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC C3500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC Jimmy, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC K1500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC K1500 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC K2500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC K2500 Suburban, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp
• Fits 1983-1986 GMC K3500, N/A; Opt. HD, 108 to 120 Amp, 9:00 Plug Position, Supplied as 120 Amp

Common Charging-System Issues

• Low battery charging output on Chevrolet C10, K10, and GMC C1500 applications
• Dim lights or unstable electrical performance under load
• Alternator failure on 12-volt Delco-style charging systems
• Worn or incorrect alternator replacement on 1983-1990 GM truck and SUV platforms
• Charging concerns on vehicles using a 1-groove V-belt setup

Installation Notes and Tips

Verify the plug position, pulley style, rotation direction, and amperage rating before installation. This alternator is specified for 9:00 plug position applications and clockwise rotation, so matching the original configuration is important for proper fitment. Confirm belt alignment and inspect the charging circuit, battery condition, and wiring connections during replacement.

Quality Assurance

WAI builds this alternator as a new unit using proprietary components and processes to support durability and performance in daily service. The 7287-9N is engineered for the amp output required by today’s electrical loads while maintaining the Delco-style fitment needed for the listed Chevrolet and GMC applications.