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Bosch Alternator - 1986A00991

Bosch Alternator - 1986A00991

The Bosch Alternator 1986A00991 is engineered to meet OE quality standards, providing reliable per...

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eBayAlternator with multi-belt pulley 1 986 A00 991 BOSCH
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Product Information

Full details

The Bosch 1986A00991 Alternator is designed for mechanics and vehicle owners seeking Original Equipment (OE) quality replacements for heavy-duty electrical systems. This high-output 28V, 150A unit ensures stable power delivery and exceptional component longevity, though it is specifically engineered without an integrated vacuum pump, requiring users to verify their vehicle's auxiliary system requirements before purchase.

All features

Model Part Number1986A00991
BrandBosch

Extended Product Information

FAQs

Is this alternator compatible with my vehicle?

This unit is a direct replacement for part numbers 0124655181 and 0124655182. Please consult your vehicle's service manual to confirm part number compatibility.

Does this model include a vacuum pump?

No, this alternator is designed without an integrated vacuum pump.

What is the pulley diameter?

The pulley diameter is 86mm.

What type of electrical connection does it use?

It uses a B+(M8) clamp connection.

What should I do if the unit makes a whining noise?

Verify the alignment of the pulley with the rest of the belt drive system. If the noise persists, check for internal bearing failure.

Troubleshooting

Battery light remains illuminated on the dashboard

Verify the B+ cable connection is secure and check the condition of the vehicle's electrical ground strap.

Audible chirping or squealing during engine idle

Inspect the 8-groove belt for wear and verify that the belt tensioner is applying correct pressure to the pulley.

Pros and Cons

Pros

  • Meets or exceeds original equipment specifications
  • High amperage output supports additional electrical accessories
  • Robust 8-groove pulley ensures minimal belt slippage
  • Rigorous insulation testing provides protection against short circuits

Cons

  • Lacks an integrated vacuum pump
  • Specific 28V voltage requirement limits compatibility to heavy-duty systems
  • Requires professional knowledge for safe installation

Setup, Compatibility & Care

Before installation, disconnect the negative battery terminal to prevent electrical shorts. Ensure the B+(M8) connection is tightened to the manufacturer's specified torque to prevent heat buildup. Because this model does not include a vacuum pump, confirm your existing vehicle setup does not rely on the alternator for vacuum assistance. Maintenance includes regular visual inspections of the pulley grooves for debris and checking for any abnormal bearing noise during operation. Always keep the area around the unit free of excessive oil or debris to maintain proper cooling airflow.

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