Sierra Stator 18-99236 for Mercury Mariner 30 50 60 HP and Yamaha 25 30 HP 4-Stroke EFI Outboards, 16 Amp

The Sierra 18-99236 stator is a 16 amp replacement charging component designed for 3/4 cylinder 4-stroke EFI outboard engines. It mounts inside the flywheel area of the powerhead and generates the AC current the engine's rectifier/regulator converts to charge the battery and power the ignition system while the engine runs. When a stator weakens or fails, symptoms typically include a no-charge condition, intermittent stalling, or a battery that will not hold a charge even after the engine has been running.

This stator is built to fit Mercury and Mariner 30, 50, and 60 HP 4-Stroke EFI outboards, as well as Yamaha 25 and 30 HP 4-Stroke EFI outboards, giving boat owners a single part that covers both Mercury/Mariner and Yamaha applications sharing this powerhead design. It is a direct equivalent for the listed OEM Mercury stator part numbers, so it installs using the same mounting points and wiring connections as the original component it replaces. At 3 pounds, it is sized to bolt into the same location as the factory unit without modification.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99236
• Product Type: Outboard Stator
• Amperage Output: 16 Amp
• Cylinder Configuration: 3/4 Cylinder
• Weight: 3 pounds
• Product Dimensions: 2.48 x 9.02 x 7.01 inches
• UPC: 808282394028

Fitment

• Mercury/Mariner 30, 50 and 60 HP 4-Stroke EFI, 2002-2008
• Yamaha 25 and 30 HP 4-Stroke EFI, 2003-2005

Replaces (OEM)

• 398878143A5
• 398-878143A05
• 398-878143T3
• 398-878143T5
• 398-878143T03
• 398-878143T05
• R398-878143T3
• R398-878143T5

Frequently Asked Questions

What engines does the Sierra 18-99236 stator fit? The Sierra 18-99236 stator fits Mercury and Mariner 30, 50, and 60 HP 4-Stroke EFI outboards built 2002-2008, as well as Yamaha 25 and 30 HP 4-Stroke EFI outboards built 2003-2005.

Is the Sierra 18-99236 a direct replacement for the factory Mercury stator? Yes, the 18-99236 stator is a direct equivalent for the OEM Mercury stator numbers it crosses to, including 398-878143A05, 398-878143T03, and 398-878143T05, so it installs in place of the original using the same mounting and wiring.

What amperage output does this stator produce? The Sierra 18-99236 stator has a 16 amp output rating.

How much does the Sierra 18-99236 stator weigh? This stator weighs 3 pounds.

What are the dimensions of this stator? The Sierra 18-99236 stator measures 2.48 x 9.02 x 7.01 inches.

What OEM part numbers does the Sierra 18-99236 replace? It replaces Mercury/Mariner stator numbers 398878143A5, 398-878143A05, 398-878143T3, 398-878143T5, 398-878143T03, 398-878143T05, R398-878143T3, and R398-878143T5.

Does this stator work on 3 cylinder and 4 cylinder engines? Yes, the Sierra 18-99236 is built for 3/4 cylinder configurations on the covered Mercury/Mariner and Yamaha 4-Stroke EFI outboards.

Will the 18-99236 stator fit a Yamaha outboard? Yes, in addition to Mercury/Mariner applications, the Sierra 18-99236 fits Yamaha 25 and 30 HP 4-Stroke EFI outboards from 2003-2005.

What symptoms indicate a stator needs replacing? A failing stator commonly causes a no-charge condition, a battery that will not hold a charge, or intermittent stalling, which the Sierra 18-99236 is designed to correct when installed as a replacement.

Does the Sierra 18-99236 include mounting hardware? The listing covers the stator component itself; it is installed using the existing mounting points and wiring connectors on the covered Mercury/Mariner and Yamaha 4-Stroke EFI outboards.

Is the Sierra 18-99236 a new part? Yes, the Sierra 18-99236 is a new replacement stator, not a rebuilt or used unit.