Alternator for Mazda CX-9 (2007-2015) 3.5L 3.7L

High-Output Direct-Replacement Alternator for 2007-2015 Mazda CX-9 (TB)

What it Does: The direct-replacement alternator restores consistent 13.5V to 14.5V charging output on the 2007-2015 Mazda CX-9 to prevent battery drain, erratic electronic module behavior, and system undervoltage.

The Stock Mazda CX-9 Charging System Failure Modes

Operating in the high-heat engine bay of the transverse-mounted MZI / Cyclone V6, the factory alternator on the TB chassis encounters severe thermal cycling over extended mileage. Common failure points include brush wear, worn drive bearings that cause belt whine or seized pulleys, and internal diode breakdown inside the rectifier. This leads to charging voltage dropouts, dimming dashboard displays, battery discharge warning lights, and insufficient power delivery to demanding vehicle electronics.

The Engineering Solution

Engineered to exact OEM dimensions, this brand-new unit features dense, high-purity copper stator windings, a precision dynamically balanced rotor, and premium sealed bearings engineered to handle sustained engine rpm without thermal breakdown. An integrated solid-state internal voltage regulator maintains a steady 110-amp output to replenish the battery and support all auxiliary electronics. Designed as an exact fit for OEM part numbers CY01-18-300, CY01-18-300A, and 11267, it utilizes the factory 6-groove pulley and matches the OE terminal harness plug with no modifications required.

What's Included

• 1 Direct-Replacement Alternator (110A, 12V, Clockwise, 6-Groove Pulley, Internal Regulator)

Technical Specifications

Compatibility

• 2007 Mazda CX-9 3.5L V6
• 2008-2015 Mazda CX-9 3.7L V6

Frequently Asked Questions & Fitment Warnings

Does this fit the TB CX-9?

Yes, this is a direct fit for the 2007-2015 Mazda CX-9 equipped with the 3.5L and 3.7L MZI / Cyclone V6 engine platforms.

Should I charge my battery before installing this alternator?

Yes, always verify the battery is fully charged to at least 12.6 volts before starting the engine to avoid overloading and overheating the new internal voltage regulator.

The Mazda Reliability Standard

Engineered for exact electrical consistency, this replacement restores dependable starting performance and steady DC voltage control under high vehicle electrical load.