Sierra Chrysler Magneto Ignition Coil 18-99275, Cross Reference 185-2370, Outboard Ignition Coil

The Sierra 18-99275 is a Chrysler magneto ignition coil built for outboard ignition systems. This coil is the component that stores and discharges the high voltage needed to fire the spark plug at the correct moment in the ignition cycle, and it is designed as a direct fit within the Chrysler outboard ignition category. Replacing a weak or failed magneto coil restores consistent spark energy, which in turn supports reliable starting, smoother idle, and steady running under load. A coil that has degraded internally (cracked insulation, breakdown under heat, or internal shorting) is a common cause of intermittent misfires, hard starting, or a no-spark condition on magneto-equipped outboards, and swapping in a fresh coil is one of the most direct ways to rule out or resolve those symptoms.

The Sierra 18-99275 carries the Sierra part number 18-99275 and is also cross-referenced under CDI Electronics part number 185-2370, giving buyers a documented equivalent to look up when comparing options. It is built to the compact form factor expected of a magneto coil, keeping installation straightforward for anyone servicing the ignition system on a Chrysler outboard motor.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99275
• Product Category: Chrysler Outboard Ignition
• Component Type: Magneto Ignition Coil
• Weight: 0.4 pounds
• OEM Cross Reference: 185-2370

Fitment

Designed for Chrysler outboard ignition systems.

Replaces (OEM)

• 185-2370

Frequently Asked Questions

What is the Sierra 18-99275 used for? It is a magneto ignition coil for Chrysler outboard ignition systems, responsible for generating the high voltage that fires the spark plug at the correct point in the ignition cycle.

Is the Sierra 18-99275 the same as CDI Electronics 185-2370? Yes, part number 185-2370 is a documented cross-reference for the Sierra 18-99275 magneto ignition coil, so either number identifies the same coil when ordering.

How much does this ignition coil weigh? The Sierra 18-99275 magneto ignition coil weighs 0.4 pounds.

What symptoms indicate this coil needs to be replaced? Hard starting, intermittent misfires, rough idle, or a complete no-spark condition on a Chrysler outboard are common signs that the magneto ignition coil, such as the Sierra 18-99275, has failed or is degrading.

Does the 18-99275 fit any outboard brand? The Sierra 18-99275 is built specifically within the Chrysler outboard ignition category, not as a universal or multi-brand coil.

Can I cross-check this part before ordering? Yes, the Sierra 18-99275 corresponds to CDI Electronics 185-2370, which can be used to confirm compatibility with your existing ignition coil before purchase.

Is this a genuine Sierra part or an aftermarket equivalent? The 18-99275 is sold under the Sierra part number, with 185-2370 listed as its cross-referenced equivalent, so buyers can match it against either identifier.

What is included when I order this coil? The order includes one Sierra 18-99275 magneto ignition coil; no additional mounting hardware or wiring is specified.

Will this coil work with points-style or electronic ignition? The Sierra 18-99275 is a magneto ignition coil, meaning it is designed for magneto-based ignition systems rather than fully electronic ignition modules.

How do I know if I need this coil versus a different ignition component? If diagnosis points to weak or absent spark output rather than a triggering, timing, or wiring fault, the magneto coil itself, like the Sierra 18-99275, is the component to replace.