# 0389549  OMC Amplifier | Genuine Used Part

🔧 Product Description

  

Genuine OMC Johnson / Evinrude Ignition Amplifier - Part Number: 0389549

  

A genuine OMC ignition amplifier used on selected early Johnson and Evinrude battery-CD ignition systems. This amplifier controls the ignition coil switching circuit and forms part of the battery-powered capacitor-discharge ignition system.

  

⚙️ Key Features

  

• Genuine OMC Johnson / Evinrude ignition amplifier

• Correct part number 0389549

• Used on early battery-CD ignition systems

• Related to 0389550 and 0777647 amplifier service family

• Must be matched by model number, ignition system and wiring layout

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 0777647 later amplifier kit reference

• 0397123 earlier related amplifier reference

• 0389551 earlier related amplifier reference

• 0389550 earlier related amplifier reference

• 0389549 earlier related amplifier reference

• 0580849 earlier related amplifier reference

• 0383299 earlier amplifier reference

  

OEM / Related Numbers:

  

• 0389549

• 389549

• 0777647

• 777647

• 0397123

• 397123

• 0389551

• 389551

• 0389550

• 389550

• 0580849

• 580849

• 0383299

• 383299

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-99238

• Aqua Power: 1638

• Aftermarket ignition amplifier replacements for 0389549 / 0389550 / 0777647 applications

  

🚤 Compatibility

  

Commonly used on:

  

• Johnson / Evinrude battery-CD ignition systems

  

Typically suits:

  

• Engine models:

• Johnson 60HP - 1970-1971 battery-CD ignition applications

• Evinrude 60HP - 1970-1971 battery-CD ignition applications

• Johnson 85HP - 1969-1972 battery-CD ignition applications

• Evinrude 85HP - 1969-1972 battery-CD ignition applications

• Johnson 100HP - 1971 battery-CD ignition applications

• Evinrude 100HP - 1971 battery-CD ignition applications

  

• HP Range: 60HP - 100HP

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

• Year Range: approximately 1969 - 1972 depending on horsepower

• Serial / Model Note: OMC fitment is model-number controlled. Match by exact engine model, original amplifier number and wiring layout.

  

🔌 Function

  

The amplifier switches the ignition coil circuit in the battery-CD system so the engine can generate timed spark.

  

Common signs of failure:

  

• No spark

• Weak or intermittent spark

• Engine starts then dies

• Ignition fault after coil and wiring checks

• Heat-related shutdown

• Spark output returns with known-good amplifier

• Corroded or damaged amplifier wiring

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 100.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Electronic Components | ECU CDI & Electrical Parts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 100.00 AUD | In stock |

## Images

- 0389549  OMC Amplifier | Genuine Used Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/0389549-omc-amplifier-genuine-used-part)
> Updated: 2026-07-18