Sierra Stator 18-5860-1, Replaces Mercury Marine 398-5454A35, Fits Mercury V135/V150 Outboards

The Sierra Stator 18-5860-1 is a replacement charging-system stator built for Mercury V135 and V150 outboard engines within specific serial number ranges. The stator is a core component of the outboard's ignition and charging circuit, generating the AC current that the engine's rectifier and CDI module rely on to fire the spark plugs and keep the battery charged while running. A worn, cracked, or shorted stator is a common cause of no-spark conditions, weak charging output, or intermittent engine stalling on older Mercury V6 outboards, and replacing it with a properly matched unit restores reliable ignition timing and charging performance.

Constructed with a metal core and winding assembly, this stator is built to withstand the vibration, heat, and saltwater exposure typical of marine use, and it is rated for use in salt water applications. It is designed to pair with the corresponding 18-5798 trigger assembly on the applicable Mercury V135 and V150 powerheads. Confirm your engine's serial number falls within the listed ranges before ordering, since Mercury used several stator and trigger combinations across the V135/V150 production run.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5860-1
• Product Category: Mercury Outboard Stators & Triggers
• Weight: 3.59 pounds
• Material: Metal
• Color: White
• Engine Type: 4 Stroke
• Fuel Type: Gasoline
• Mounting Type: Transom Mount
• Recommended Use: For Salt Water
• Included Components: Stator
• UPC: 808282392468
• OEM Cross Reference: Mercury Marine 398-5454A35

Fitment

• Mercury V135 outboard, serial number A904646 to C100860, used with 18-5798 trigger
• Mercury V135 outboard, serial number C239553 to D081999, used with 18-5798 trigger
• Mercury V150 outboard, serial number A904646 to C100860, used with 18-5798 trigger
• Mercury V150 outboard, serial number C239553 to D081999, used with 18-5798 trigger

Replaces (OEM)

• Mercury Marine 398-5454A35

Frequently Asked Questions

What engines does the Sierra 18-5860-1 stator fit? The 18-5860-1 stator fits Mercury V135 and V150 outboards within the serial number ranges A904646 to C100860 and C239553 to D081999, paired with the 18-5798 trigger assembly. Check your outboard's serial number tag against these ranges before ordering, since Mercury used more than one stator across the V135/V150 production run.

Is the 18-5860-1 stator the same as the Mercury OEM part? Yes, the Sierra 18-5860-1 is a direct replacement for Mercury Marine part number 398-5454A35 and is built to match its fit and electrical output.

How much does this stator weigh? The Sierra 18-5860-1 stator weighs 3.59 pounds.

What is the stator made of? The 18-5860-1 stator has a metal core and winding construction designed to hold up to marine vibration and heat.

Can this stator be used in salt water? Yes, the 18-5860-1 stator is rated for use in salt water applications on applicable Mercury V135/V150 outboards.

Do I also need to replace the trigger when installing this stator? The 18-5860-1 stator is designed to work with the 18-5798 trigger assembly on Mercury V135/V150 outboards; if your existing trigger is in good condition and matches your engine's serial range, it does not need to be replaced at the same time, but the two components are listed together for these serial ranges.

What symptoms indicate a failed stator like the 18-5860-1 needs replacement? A failing stator on a Mercury V135/V150 outboard commonly causes no-spark conditions, weak or inconsistent charging, or intermittent stalling, which is the typical reason boaters replace the 18-5860-1.

What is included when I order the 18-5860-1? The order includes one Sierra 18-5860-1 stator; no trigger, wiring harness, or additional hardware is included.

Is the Sierra 18-5860-1 a genuine Sierra part or aftermarket? The 18-5860-1 is a Sierra-branded stator manufactured as a replacement part, sold under Sierra's own part number rather than as a Mercury-branded component.

What color is the 18-5860-1 stator? The Sierra 18-5860-1 stator has a white finish.

How do I confirm my Mercury outboard's serial number matches this stator? Locate the serial number plate on your Mercury V135 or V150 powerhead and compare it to the 18-5860-1 stator's listed ranges of A904646 to C100860 or C239553 to D081999; a serial number outside those ranges means a different stator is required.