Sierra 18-99162 Mercury Mariner Stator, 16 Amp, 2/3/4 Cylinder Outboards, Replaces 398-832075A12

The Sierra 18-99162 is a stator built for Mercury and Mariner outboard engines, supplying the charging system's AC output that feeds the rectifier and keeps the battery charged while the engine runs. It is rated at 16 amps and is designed for 2, 3, and 4 cylinder Mercury/Mariner powerheads. A failing or weak stator is a common cause of no-charge or intermittent-charge conditions on these outboards, and replacing it with a correctly rated unit restores consistent charging output. This stator is a direct cross-reference for OEM number 398-832075A12, so it installs in place of the original Mercury/Mariner unit without modification. It fits a range of Mercury and Mariner 3-cylinder and 4-cylinder engines, including several JET drive models, making it a common service and rebuild part for outboard technicians and DIY boat owners maintaining their charging system. Sierra part 18-99162 is sold as a complete stator assembly ready to wire into the existing harness.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99162
• Category: Mercury Outboard Stators & Triggers
• Amperage: 16 Amp
• Cylinder Configuration: 2, 3 & 4 Cylinder
• Weight: 3.2 pounds
• UPC: 808282393656

Fitment

• Mercury/Mariner 3 cylinder outboards, 1987-1997: 45 JET, 50, 55, 60, 65 JET, 70, 75, 80, 90, 95 HP
• Mercury/Mariner 4 cylinder outboards, 1989-1997: 30 JET, 40, 80 JET, 100, 115, 120 JET, 125 HP

Replaces (OEM)

• 398-832075A12

Frequently Asked Questions

What does the Sierra 18-99162 stator do? It supplies the AC charging current from the flywheel to the rectifier on Mercury and Mariner outboards, which is what keeps the battery charged while the engine runs.

What outboards is the 18-99162 stator compatible with? It fits Mercury/Mariner 3 cylinder outboards including 45 JET, 50, 55, 60, 65 JET, 70, 75, 80, 90 and 95 HP from 1987-1997, and 4 cylinder outboards including 30 JET, 40, 80 JET, 100, 115, 120 JET and 125 HP from 1989-1997.

Is the Sierra 18-99162 a direct replacement for the OEM Mercury stator? Yes, Sierra 18-99162 cross-references to OEM part number 398-832075A12 and installs in place of the original stator.

How many amps is the Sierra 18-99162 stator rated for? 16 amps, matching the output of the Mercury/Mariner 2, 3, and 4 cylinder charging systems it is designed for.

How much does the 18-99162 stator weigh? 3.2 pounds as sold by Sierra.

Will this stator work on a 2 cylinder Mercury outboard? Sierra lists the 18-99162 for 2, 3, and 4 cylinder Mercury/Mariner engines, so it covers 2 cylinder applications in that lineup.

What symptoms indicate the stator needs to be replaced? A weak, intermittent, or no-charge condition on a Mercury/Mariner outboard's battery is a typical sign the stator, such as the Sierra 18-99162, has failed.

Does the 18-99162 include mounting hardware? It is sold as the stator assembly itself; the listing does not specify separate mounting hardware being included.

Is Sierra 18-99162 an OEM part or aftermarket? It is an aftermarket Sierra-brand stator manufactured as a cross-reference replacement for OEM number 398-832075A12.

Can I use the 18-99162 stator on both Mercury and Mariner outboards? Yes, Sierra 18-99162 is designated for both Mercury and Mariner branded outboards within its listed cylinder and horsepower range.