Bosch AL27X Alternator

Bosch AL27X Remanufactured Alternator

The Bosch AL27X is a remanufactured 12-volt alternator built for steady charging performance in classic Audi and Volkswagen applications. It is a 90-amp unit with an internal regulator, internal fan, and included pulley for direct replacement service.

Key Features

• Remanufactured Bosch alternator for charging-system repair
• 12-volt, 90-amp output
• Internal regulator and internal fan design
• Clockwise rotation
• Single-groove 1V pulley included
• Aluminum case and aluminum housing construction
• External fan included
• External regulator included
• Plug type 380 with rear-view plug clocking at 11 o’clock

Product Details

Bosch Premium Alternators are remanufactured, tested, and built to deliver dependable electrical output for vehicles that need stable battery charging and consistent system voltage. The AL27X is a direct-fit style replacement for select Audi 4000, Audi 4000 Quattro, Audi Coupe, Audi Quattro, Audi 5000 Quattro, and Volkswagen models including Golf, Jetta, Cabriolet, Quantum, Vanagon, Rabbit Convertible, and Volkswagen Cabriolet applications listed below. This part cross-references Bosch 026903017BX and 034903015D for the same application. Use Bosch AL27X when replacing a worn alternator on 1984-1988 Audi and Volkswagen charging systems that call for this configuration.

Vehicle Fitment

• Fits 1986-1988 Audi 5000 Quattro, N/A
• Fits 1985-1986 Volkswagen Golf, N/A, with Air Conditioning
• Fits 1986 Volkswagen Jetta, N/A, to 90 Amp Alternator; with Bosch Unit
• Fits 1985 Audi Coupe, N/A, without Air Conditioning; From Chassis # 09001
• Fits 1985 Audi Coupe, N/A, without Air Conditioning; To Chassis # 09000
• Fits 1985 Audi Quattro, N/A, without Air Conditioning
• Fits 1985 Volkswagen Cabriolet, N/A, with Air Conditioning
• Fits 1984-1985 Volkswagen Jetta, N/A, with Air Conditioning
• Fits 1985 Volkswagen Quantum, N/A, without Air Conditioning
• Fits 1984-1985 Volkswagen Quantum, N/A, with Air Conditioning
• Fits 1983-1985 Volkswagen Vanagon, N/A
• Fits 1984 Audi 4000, N/A
• Fits 1984 Audi 4000 Quattro, N/A
• Fits 1984 Audi Coupe, N/A, without Air Conditioning
• Fits 1984 Volkswagen Rabbit Convertible, N/A, with Air Conditioning

Common Repair Uses

• Charging warning light or battery light staying on
• Low system voltage during driving or idle
• Battery not maintaining charge after normal use
• Alternator bearing, regulator, or output failure
• Electrical instability in older Audi and Volkswagen charging systems

Installation Notes

Verify pulley type, plug type, rotation direction, and amperage rating before installation. Confirm the vehicle’s air conditioning configuration and chassis breakpoints where listed, especially on 1985 Audi Coupe applications. Check belt alignment, wiring condition, and battery state of charge during replacement to help ensure proper charging-system operation.

Quality Assurance

This Bosch remanufactured alternator is built and tested to support reliable performance in service. Bosch’s Premium Alternator line is engineered for consistent electrical output and dependable operation in the specified Audi and Volkswagen applications.