---
product_id: 97819868
title: "Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511"
brand: "aa ignition"
price: "$74.19"
currency: USD
in_stock: true
reviews_count: 13
category: "Aa Ignition"
url: https://www.desertcart.us/products/97819868-marine-ignition-coil-compatible-with-mercruiser-boat-ignition-coil-inboard
store_origin: US
region: United States of America
---

# High-voltage spark output Direct-fit plug-and-play Marine-grade sealed durability Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511

**Brand:** aa ignition
**Price:** $74.19
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your marine adventures with unmatched reliability!

## Quick Answers

- **What is this?** Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 by aa ignition
- **How much does it cost?** $74.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/97819868-marine-ignition-coil-compatible-with-mercruiser-boat-ignition-coil-inboard)

## Best For

- aa ignition enthusiasts

## Why This Product

- Trusted aa ignition brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Precision:** Engineered as a direct-fit replacement for MerCruiser GM V6 & V8 engines with Thunderbolt IV & V systems—no modifications needed.
- • **Effortless Ignition Power:** Delivers a reliable high-voltage spark to eliminate hard starts and misfires, keeping your MerCruiser engine firing flawlessly.
- • **Cross-Reference Confidence:** Replaces multiple OEM part numbers (18-5438, 392-805570A2, 72115, and more) ensuring perfect compatibility and peace of mind.
- • **Backed by a 2-Year Warranty:** AA Ignition stands behind this coil with a hassle-free replacement policy, saving you time and dealer markups.
- • **Built for the Harshest Marine Conditions:** Constructed with marine-grade materials sealed against moisture, heat, and vibration for long-lasting, worry-free performance.

## Overview

This Marine Ignition Coil is a premium direct replacement for MerCruiser GM V6 and V8 engines equipped with Thunderbolt IV & V ignition systems. Designed to deliver consistent high-voltage spark output, it resolves common ignition issues like hard starting and misfires. Built with marine-grade materials, it resists moisture, heat, and vibration for durable performance. Compatible with multiple OEM part numbers, it installs easily with a plug-and-play design and is backed by a 2-year warranty for dependable peace of mind.

## Description

Buy Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511: Coils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: No issues so far … - So far so good !!
Review: Great replacement; - Easy to put on, replaced on a Mercruiser 7.4l W/ Thunderbolt IV ignition. Hadn't failed me yet, so all and all, a very good product.

## Features

- MARINE IGNITION COIL - This marine ignition coil delivers high-voltage spark to fire the spark plugs on your marine engine. Fixes hard starting, misfire, rough running, and no-spark conditions caused by a worn or failed coil. A direct-fit, plug-and-play replacement - no modifications required.
- COMPATIBLE WITH MERCRUISER ENGINES - Direct-fit replacement for: MerCruiser GM V6 Engine with Thunderbolt IV & V Ignition System | MerCruiser GM V8 308 Engine with Thunderbolt IV & V Ignition System | MerCruiser GM V8 350 Engine with Thunderbolt IV & V Ignition System. Confirm your vehicle and match your part number, then see the full compatibility chart below to guarantee correct fit.
- REPLACES PART# - 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511. Cross-references the OEM and popular aftermarket numbers above - match any one of these numbers on your original part to confirm this is the correct replacement.
- OEM FIT, QUALITY & FINISH - While this is NOT a genuine OEM part, it is a direct replacement engineered to meet or exceed factory specifications, built with marine-grade construction sealed against moisture, heat, and vibration for reliable, long-lasting performance.
- 2-YEAR WARRANTY - Backed by AA Ignition. If this marine ignition coil ever fails, contact us for a replacement - saving you time and money versus dealer prices. For a complete repair, we recommend replacing your spark plugs and distributor cap at the same time.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07GL4TM27 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #34,914 in Automotive ( See Top 100 in Automotive ) #65 in Automotive Replacement Ignition Coils |
| Brand | AA Ignition |
| Brand Name | AA Ignition |
| Compatible with Vehicle Type | Boat |
| Connector Gender | Male-to-Female |
| Customer Reviews | 4.4 out of 5 stars 876 Reviews |
| EU Spare Part Availability Duration | 2 years |
| Installation Type | Plug In |
| Item Dimensions | 20.47 x 16.93 x 7.87 inches |
| Item Weight | 0.6 kg |
| Item dimensions L x W x H | 20.47 x 16.93 x 7.87 inches |
| Manufacturer | AA Ignition |
| Manufacturer Part Number | 18-5438 |
| Manufacturer Warranty Description | 12 Months Warranty |
| Model Number | 18-5438 |
| Number of Items | 1 |
| OEM Equivalent Part Number | 18-5438, 3000-8M0079202, 392-7803, 64570, RL5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511, 9-29701 |
| Part Interchange Info | replacement |
| Vehicle Service Type | Boat |

## Product Details

- **Brand:** AA Ignition
- **Vehicle Service Type:** Boat
- **Item Weight:** 0.6 Kilograms
- **Connector Gender:** Male-to-Female
- **Installation Type:** Plug In

## Images

![Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 - Image 1](https://m.media-amazon.com/images/I/71-puCcI7VL.jpg)
![Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 - Image 2](https://m.media-amazon.com/images/I/7148gb6tMfL.jpg)
![Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 - Image 3](https://m.media-amazon.com/images/I/71xfUSAum3L.jpg)
![Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 - Image 4](https://m.media-amazon.com/images/I/71FxRmJq-tL.jpg)
![Marine Ignition Coil - Compatible with MerCruiser - Boat Ignition Coil - Inboard Ignition Coil - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 - Image 5](https://m.media-amazon.com/images/I/71vplk1MdbL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ No issues so far …
*by A***R on September 15, 2025*

So far so good !!

### ⭐⭐⭐⭐⭐ Great replacement;
*by J***T on May 13, 2026*

Easy to put on, replaced on a Mercruiser 7.4l W/ Thunderbolt IV ignition. Hadn't failed me yet, so all and all, a very good product.

### ⭐⭐⭐⭐⭐ Great value, good quality and low price
*by T***D on July 21, 2021*

It was great to see that this coil for my Mercruiser 5.7L actually had brass terminal posts. After the problems about inferior terminals on other manufactures coils, namely aluminum or some sort of pot metal, that were easily broken as they were tightened, this coil had stronger brass posts and even came with the nuts tightened and the lock washers compressed. That told me this coil had a good chance of being installed without breaking anything. With a two year warranty, what's to lose?

## Frequently Bought Together

- Replacement Inboard Ignition Coil - Compatible with MerCruiser Thunderbolt IV and V Ignition Systems with HEI - Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511
- THUNDERBOLT Distributor Cap and trigger wheel Rotor Kit with gasket and screws for Mercruiser 5.0, 5.7, 7.4, 8.2 5.0L 5.7L 7.4L 8.2L V8 engines 805759Q3, 805759T3 18-5935.
- B. Ignition Sensor Kit for MerCruiser Thunderbolt I IV Distributor

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-27*