Bosch Alternator 12V 140A 1986A00905

This Bosch alternator is a 12V, 140A unit, part number 1986A00905, supplied as an alternator with an internal regulator and a clockwise rotation. It is listed as an alternator type excl. vacuum pump, with a 6 groove pulley and a 56mm pulley outside diameter.

It is noted as suitable for stop start applications, which makes the 140A output and charging control relevant when matching the unit to the original fitment. The mounting details provided include a quad leg alternator mount, double pivot lever fastening type, 127mm mount centre-to-centre, and 61mm inside mounting legs.

Bosch lists this unit with pin code IR201 and manufactured in Spain. The alternator is supplied each, carries a 12 month warranty, and is described as a Bosch alternator 12V 140A under product group rotating electrical and alternators.

Key Features

• 12V alternator with 140A charge current
• Internal regulator
• 6 groove pulley
• Clockwise rotation
• Suitable for stop start applications
• Alternator type excl. vacuum pump

Specifications

• Brand: Bosch
• Part No.: 1986A00905
• Pin Code: IR201
• Voltage: 12V
• Power Rating / Charge Current: 140A
• Pulley Section: 6 Groove
• Pulley Outside Diameter: 56mm
• Rotation: CW

Fitment guidance

• Fitment data supplied references Skoda applications.
• Referenced makes and models include Skoda Octavia, Skoda Roomster, Skoda Superb and Skoda Yeti.
• Sample application listings include Skoda Octavia model years 2009, 2010, 2011, 2012 and 2013.
• The fitment preview also shows Skoda Roomster model years 2010, 2011, 2012, 2013 and 2014.
• Because alternators must match mounting, pulley and electrical details exactly, confirm the 127mm centre-to-centre mount, 61mm inside mounting legs, 6 groove pulley and IR201 pin code before ordering.

Application and Buying Notes

An alternator needs to match more than just voltage, and this Bosch unit is specified at 12V and 140A with a CW rotation. The listed quad leg mount, double pivot lever fastening and 127mm mount centre-to-centre are the key physical checkpoints, because even a small difference in bracket arrangement can stop the part from fitting correctly.

The pulley and regulator details are equally important. This unit has a 6 groove pulley, a 56mm pulley outside diameter and an internal regulator, so the original alternator should be checked against those points before purchase. If the vehicle uses a different belt layout or pulley section, the part may not line up correctly even if the electrical rating appears similar.

Bosch notes this alternator suits stop start applications and lists it as alternator type excl. vacuum pump. That makes it important to compare the original unit carefully, especially where accessories, belt routing or alternator housing style differ between build variants. The recommended additional repair is a V-Belt or V-Ribbed Belt, which is worth checking if the existing belt shows wear or glazing.

If you are replacing a failed alternator, compare the part number 1986A00905 and the pin code IR201 against the old unit where possible. Measurements such as the 61mm inside mounting legs and M8x1.25 / 8 pivot hole diameter can be used as a practical cross-check alongside the application details. When in doubt, a physical comparison of the old alternator remains the safest approach.

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 1986A00905 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, Unit of Measure EACH, Warranty 12 Months, Pin Code IR201, Power Rating (Amp) 140, Pulley Section 6 Groove, Rotation CW, Note Suits stop start applications, Mount Cnt to Cnt 127mm, Fastening Type Double Pivot Lever.

Additional published details for cross-checking include Recommended additional repairs V-Belt/V-Ribbed Belt, Packaging width 18.5, Manufactured in Spain, Product Group 1 ROTATING ELECTRICAL, Part No. 1986A00905, Brand BOSCH, Description Bosch Alternator 12V 140A, Inside Mounting Legs 61mm, Pivot Hole Diameter M8x1.25 / 8, Pulley Outside Diameter 56mm.

Bosch Alternator 12V 140A. Part number 1986A00905 should be checked first. Listed voltage is 12. Listed output rating is 140. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Quad Leg. Regulator type is Internal. Pulley configuration is 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 1986A00905, 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 in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 140 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include SKODA OCTAVIA, SKODA OCTAVIA 2009, SKODA OCTAVIA 2010, SKODA OCTAVIA 2011. 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: Please confirm fitment by matching part number 1986A00905, pin code IR201, mounting style, pulley specification and the vehicle application details before ordering. Alternator fitment can vary by build date, engine and accessory layout, so the original unit should be checked closely.

FAQ

What is the voltage and output of this Bosch alternator?

It is a 12V alternator with a 140A charge current rating.

What is the part number?

The supplied part number is 1986A00905.

Does this alternator have an internal regulator?

Yes. The regulator type is listed as internal.

What pulley setup does it use?

It has a 6 groove pulley with a 56mm outside diameter.

Is this alternator suitable for stop start applications?

Yes. It is noted as suitable for stop start applications.

What should I check before buying?

Confirm the part number 1986A00905, IR201 pin code, 12V 140A rating, CW rotation, 6 groove pulley, and the mounting dimensions shown for the original alternator.