Bosch Alternator 12V 90A 1986A00778

The Bosch Alternator 12V 90A, part number 1986A00778, is a passenger alternator supplied as an each unit and rated at 90 amps. It is a 12 volt unit with an alternator type listed as excl. vacuum pump, so it is important to check the vehicle application details before ordering.

Bosch lists this unit under rotating electrical and alternators, with manufacture in China and a 12 month warranty. The product is described as a Bosch Alternator 12V 90A, built to the same rigorous production standard as OE parts and intended for consistent service in demanding conditions.

Key Features

• 90 amp alternator output
• 12 volt passenger alternator
• Bosch part number 1986A00778
• Alternator type: excl. vacuum pump
• Double pivot lever fastening type
• Recommended with V-belt/V-ribbed belt inspection or replacement

Specifications

• Brand: Bosch
• Product type: Alternator passenger
• Voltage: 12V
• Power rating: 90A
• Alternator charge current: 90A
• Unit of measure: Each
• Part No.: 1986A00778
• Fastening type: Double pivot lever

Fitment information supplied

• Skoda Roomster
• Skoda Roomster 2008
• Skoda Roomster 2009
• Skoda Roomster 2010
• Volkswagen Bora
• Volkswagen Bora 1999
• Volkswagen Bora 2000
• Volkswagen Bora 2001

Application and Buying Notes

Before buying, confirm the vehicle application against part number 1986A00778 and the listed alternator details: 12V, 90A, passenger alternator, and excl. vacuum pump. Those identifiers are the safest way to compare against the original unit already fitted to the vehicle.

The fastening type is listed as double pivot lever, so the mounting arrangement needs to match the vehicle’s existing setup. If the original alternator uses a different bracket or mounting style, this unit may not be suitable even if the vehicle brand appears in the fitment list.

Bosch recommends additional attention to the V-belt or V-ribbed belt when replacing this alternator. In practical terms, a worn belt, poor tension, or contamination can affect charging performance, so it is sensible to inspect the belt condition during the job rather than fitting the alternator on its own.

This alternator is rated at 90 amps, which is the key charging specification to compare with the original part. Matching voltage is only part of the check; the current output, mounting style, and whether the unit is the vacuum pump type or not all need to line up for a proper replacement.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number 1986A00778 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR PASSENGER, Unit of Measure EACH, Warranty 12 Months, Voltage 12, Fastening Type Double Pivot Lever, Recommended additional repairs V-Belt/V-Ribbed Belt, Packaging width 20, Manufactured in China, Product Group 1 ROTATING ELECTRICAL, Part No. 1986A00778.

Additional published details for cross-checking include Brand BOSCH, Description Bosch Alternator 12V 90A, Power Rating (Amp) 90, Alternator Charge Current [A] 90, Alternator Type excl. vacuum pump, Packaging length 23.9, Packaging height 20, Product Group 2 ALTERNATORS.

Bosch Alternator 12V 90A. Part number 1986A00778 should be checked first. Listed voltage is 12. Listed output rating is 90. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 1986A00778, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a alternator passenger in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 90 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009, SKODA ROOMSTER 2010, VOLKSWAGEN BORA, VOLKSWAGEN BORA 1999. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

Compatibility note: Always confirm fitment by matching Bosch part number 1986A00778, 12V 90A output, double pivot lever mounting, and the excl. vacuum pump application details against the vehicle currently being serviced. If there is any doubt, compare the original alternator label and mounting arrangement before purchase.

FAQ

What is the part number for this Bosch alternator?

The part number supplied is 1986A00778. For this listing, part number 1986A00778 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009. These details should still be checked against the original unit before ordering.

What voltage and output does this alternator have?

It is a 12 volt alternator rated at 90 amps, with alternator charge current also listed as 90A. For this listing, part number 1986A00778 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009. These details should still be checked against the original unit before ordering.

Does this alternator include a vacuum pump?

No. The alternator type is listed as excl. vacuum pump. For this listing, part number 1986A00778 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009. These details should still be checked against the original unit before ordering.

What mounting type does it use?

The fastening type is listed as double pivot lever. For this listing, part number 1986A00778 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009. These details should still be checked against the original unit before ordering.

Which vehicles are listed for fitment?

Fitment information supplied includes Skoda Roomster, Volkswagen Bora, Volkswagen Golf, Volkswagen New Beetle and Volkswagen Transporter, with model years shown for some applications. The safest check is to match the part number and the original alternator details on the vehicle. For this listing, part number 1986A00778 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009. These details should still be checked against the original unit before ordering.

Is there any additional repair item recommended with this alternator?

Yes. A V-belt or V-ribbed belt is listed under recommended additional repairs, so the belt should be inspected during replacement. For this listing, part number 1986A00778 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include SKODA ROOMSTER, SKODA ROOMSTER 2008, SKODA ROOMSTER 2009. These details should still be checked against the original unit before ordering.