0389550 0777647 OMC Amplifier | Genuine Used Part

🔧 Product Description

Genuine OMC Johnson / Evinrude Ignition Amplifier Kit - Part Numbers: 0389550 and 0777647

A genuine OMC ignition amplifier / power pack kit used on selected early Johnson and Evinrude battery-CD ignition systems. This amplifier kit services earlier OMC amplifier references and is used on compatible 60HP, 85HP and 100HP outboards.

⚙️ Key Features

• Genuine OMC Johnson / Evinrude ignition amplifier kit

• Includes / cross-references part numbers 0389550 and 0777647

• Supersedes earlier amplifier references 0389551, 0397123, 0580849 and 0383299

• Used on selected 60HP, 85HP and 100HP battery-CD ignition systems

• Critical ignition-control component requiring coil, sensor and wiring checks before replacement

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 0777647 replacement amplifier kit reference

• 0397123 earlier amplifier reference

• 0389551 earlier amplifier reference

• 0389550 earlier amplifier reference

• 0580849 earlier amplifier reference

• 0383299 earlier amplifier reference

OEM / Related Numbers:

• 0777647

• 777647

• 0389550

• 389550

• 0397123

• 397123

• 0389551

• 389551

• 0580849

• 580849

• 0383299

• 383299

Aftermarket / Verified Equivalents:

• Sierra: 18-99238

• Aqua Power: 1638

• Aftermarket ignition amplifier replacements for 0389550 / 0777647 applications

🚤 Compatibility

Commonly used on:

• Johnson / Evinrude battery-CD ignition systems

Typically suits:

• Engine models:

• Johnson 60HP - 1970-1971

• Evinrude 60HP - 1970-1971

• Johnson 85HP - 1969-1972

• Evinrude 85HP - 1969-1972

• Johnson 100HP - 1971

• Evinrude 100HP - 1971

• HP Range: 60HP - 100HP

• Engine Type: Johnson / Evinrude two-stroke outboard with compatible battery-CD ignition

• Year Range: Approximately 1969 - 1972 depending on horsepower

• Fitment Note: Confirm original amplifier number, ignition coil kit, wiring layout and model number before installation.

🔌 Function

The amplifier controls the ignition signal in battery-CD ignition systems, switching the ignition coil circuit so spark is generated at the correct timing point.

Common signs of failure:

• No spark

• Intermittent spark loss

• Engine starts then dies

• Weak spark after coil and wiring checks

• Misfire across affected cylinders

• Ignition output fault isolated to amplifier

• Heat-related shutdown or internal module failure

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated