Sierra Power Pack 18-99313 for Johnson Evinrude CD3/6 Ignition Systems

The Sierra 18-99313 is a CDI power pack built as a direct replacement component for Johnson Evinrude outboards equipped with CD3/6 ignition systems. The power pack is the electronic control module at the heart of a CD (capacitor discharge) ignition system, storing and timing the electrical charge sent to the coils to fire the spark plugs at the correct moment in each cylinder's cycle. When a power pack begins to fail, engines typically show symptoms such as hard starting, misfiring, rough idle, loss of power at higher RPM, or a complete no-spark condition, and replacing the power pack with a properly matched unit like the 18-99313 restores reliable ignition timing and spark output.

This power pack is designed specifically for Johnson Evinrude engines running a CD3/6 ignition system, so it should be matched against the ignition system type on the engine rather than swapped in as a universal part. Installation follows the standard power pack replacement procedure: disconnecting the wiring harness from the failed unit, mounting the new power pack in the same location, and reconnecting the harness leads in their original positions. The compact housing keeps the unit lightweight for its application, and it is sold as a complete, ready-to-install replacement module.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99313
• Product Category: Outboard Power Pack
• Application: Johnson Evinrude CD3/6 ignition systems
• Weight: 0.6 pounds
• UPC: 808282396121

Fitment

Designed for Johnson Evinrude outboard engines equipped with a CD3/6 ignition system.

Frequently Asked Questions

What is the Sierra 18-99313 power pack used for? It serves as the electronic ignition control module for Johnson Evinrude outboard engines running a CD3/6 ignition system, timing and delivering the capacitor discharge that fires each cylinder's spark plug.

Will the 18-99313 fit any Johnson or Evinrude outboard? No. The Sierra 18-99313 is built for engines equipped specifically with a CD3/6 ignition system, so it should be matched to that ignition type rather than installed as a universal fit across all Johnson Evinrude models.

How much does the Sierra 18-99313 power pack weigh? The power pack weighs 0.6 pounds.

What symptoms indicate a power pack needs to be replaced? Hard starting, misfiring, rough idle, power loss at higher RPM, or a complete no-spark condition are common signs that a CD ignition power pack such as the 18-99313 has failed and needs replacement.

Is the 18-99313 a new or remanufactured unit? The Sierra 18-99313 is sold as a new, complete power pack ready for installation.

Does the power pack come with mounting hardware or a wiring harness? The 18-99313 is supplied as the power pack module itself; it is installed by reconnecting the existing engine wiring harness to the new unit in place of the failed power pack.

Can I install the Sierra 18-99313 myself? Installation involves disconnecting the wiring harness from the old power pack, mounting the 18-99313 in the same location, and reconnecting the harness leads, which is a straightforward swap for anyone comfortable working on outboard ignition components.

What ignition system does the 18-99313 work with? It is designed for the CD3/6 capacitor discharge ignition system used on Johnson Evinrude outboards.

Is the Sierra 18-99313 an OEM or aftermarket part? The 18-99313 is sold under the Sierra brand as a replacement power pack for the specified Johnson Evinrude CD3/6 ignition application.

What is the UPC for the Sierra 18-99313 power pack? The UPC for this power pack is 808282396121.