Alternator with Decoupler Pulley for Volvo S60, S80, V60, V70, XC60, XC70 & XC90

An Alternator with Decoupler Pulley for Volvo's Inline-Six and Five-Cylinder Lineup

This is a 180-amp, 12-volt alternator with an internal decoupler pulley built for a wide range of Volvo models, cross-referenced to OE numbers 6G910300MA and 6G910300MB. If your battery warning light is on, your battery keeps dying even after a jump, or you're hearing a rattling or grinding noise from the front of the engine that changes with RPM, a worn alternator or a seized decoupler pulley is a common cause across this Volvo lineup.

Why One Alternator Covers So Many Volvo Models

Volvo built its S60, S80, V60, V70, XC60, XC70, and XC90 model lines on closely related platforms during this era, sharing the same family of five- and six-cylinder engines along with the electrical architecture and accessory mounting points that go with them. Because the alternator's charging output and mounting geometry are tied to the engine and electrical system rather than to body style, the same counterclockwise-rotation, 180-amp unit with its decoupler pulley was specified across a sedan, two wagons, and three SUVs that otherwise share little in outward appearance.

Key Features

• Cross-referenced to OE numbers 6G910300MA, 6G910300MB, 11346N, and 0125811051
• 180-amp output at 12 volts for reliable charging under load
• Internal decoupler pulley absorbs engine vibration and belt noise
• Counterclockwise rotation, direct-fit replacement

Specifications

• Amperage: 180A
• Voltage: 12V
• Rotation: Counterclockwise
• Pulley: Decoupler pulley, internal class
• Condition: New

Compatibility

Fits the 2012 Volvo S60 2.5L, 2011-2016 S60 3.0L, 2008-2015 S80 3.0L, 2007-2014 S80 3.2L, 2015-2016 V60 3.0L, 2008-2010 V70 3.2L, 2010-2016 XC60 3.0L, 2012-2015 XC60 3.2L, 2009-2015 XC70 3.0L, 2008-2015 XC70 3.2L, and 2007-2014 XC90 3.2L. Because Volvo offered several engine displacements across these body styles and years, it's worth confirming your specific engine against the OE numbers above before ordering, or contacting us with your VIN if you're unsure.

Signs Your Alternator or Decoupler Pulley Needs Replacing

A failing alternator on these Volvo models typically shows up as a battery warning light on the dash, dimming or flickering headlights and interior lights, a battery that won't hold a charge, or accessories like power windows operating sluggishly. A worn decoupler pulley specifically tends to announce itself with a rattling, grinding, or clicking noise from the front of the engine that changes with engine speed, since the decoupler's job is to let the pulley freewheel briefly during belt deceleration and a seized or worn-out unit loses that ability.

Why Replace the Complete Alternator Assembly

The decoupler pulley on these Volvo alternators is built into the unit as a single assembly rather than sold as a separate serviceable part, which is why replacing the complete alternator is the standard repair rather than attempting to swap the pulley alone. Starting with a new, fully assembled alternator means the internal windings, bearings, voltage regulator, and decoupler pulley are all fresh at once, avoiding the risk of a repeat failure from pairing new pulley hardware with aging internal components.

Installation Notes

Replacing this alternator means disconnecting the battery, relieving tension on the serpentine belt to slip it off the pulley, disconnecting the electrical connectors and battery cable from the alternator, removing the mounting bolts, and installing the new unit in reverse order before reconnecting the battery. Because the alternator sits low in the engine bay on many of these Volvo models and access can be tight, having the correct socket and extension on hand before starting makes the job considerably easier.

Ordering Information

This alternator is in stock and ships ready to install. Our Shipping Information page covers current timelines, and our Warranty and Returns pages explain what to do if anything isn't right on arrival. Not sure this matches your specific Volvo and engine? Our Request a Part page is the fastest way to confirm before you order.

Related Parts

This alternator is listed in our Volvo collection, along with our Alternators collection, where you'll find other charging system parts for the S60, S80, V60, V70, XC60, XC70, and XC90.