AA Ignition Replacement Inboard Coil for MerCruiser Thunderbolt IV/V HEI Systems
- £42.67
- £42.67
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Description
xOverview
Reliable ignition is essential for smooth engine operation on marine projects. The AA Ignition Replacement Inboard Coil is designed to deliver a clean, consistent spark for inboard engines that use MerCruiser Thunderbolt IV or V ignition systems with HEI. If your boat has shown signs like hard starting, reduced power when the engine heats up, or erratic running, a high-quality replacement coil can help restore driveability without guessing at the root cause.
This coil is built as a direct, OEM-like replacement, crafted to resemble the factory part in fit and finish. It sits alongside the distributor and is intended for boats that rely on HEI systems. The goal is to provide a practical upgrade option that aligns with original design while offering the confidence of a robust aftermarket alternative.
Compatibility and Installation
Designated for MerCruiser GM V6 and V8 engines equipped with Thunderbolt IV and V ignition systems, this coil works exclusively with HEI (High Energy Ignition) setups and will not operate with Point Ignition configurations. It replaces a broad set of part numbers (including 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511) and is intended to restore proper spark and fuel ignition in supported engines.
Though not a genuine OEM part, the coil is a direct replacement that mirrors the factory part’s fit and performance. This means a straightforward swap, with the potential to save time and money versus dealer options, while maintaining a familiar installation footprint beside the distributor.
What You Get and How It Helps
- Replaces worn or failed ignition coils to re-establish a reliable spark, aiding cold and warm starts.
- Supports MerCruiser Thunderbolt IV and V HEI systems for consistent engine behavior under load and at idle.
- OEM-like quality and finish provide a familiar look and fit for straightforward DIY maintenance.
- Potential improvements in throttle response and driveability by maintaining steady ignition performance.
- Designed for dependable operation with inboard marine engines, reducing the risk of misfires caused by aging components.
- Two-year or 24,000-mile warranty offers assurance and a path to replacement if needed.
Quality, Warranty, and Buying Confidence
AA Ignition backs this coil with a two-year or 24,000-mile warranty. If the coil fails within the coverage period, you can request a replacement per the warranty terms. This part is intended to deliver OEM-style reliability and a cost-conscious alternative to dealer parts.
Before purchase, verify that your engine configuration matches a Thunderbolt IV or V HEI ignition setup. This helps ensure a correct match and optimal performance for your MerCruiser inboard system. While not a genuine OEM component, the coil is designed to closely mirror factory specs for compatibility and ease of installation.
FAQ
Q: What engines is this coil compatible with?
A: Designed for MerCruiser GM V6 and V8 engines using Thunderbolt IV or V HEI ignition systems.
Q: What warranty does this replacement coil include?
A: 2-year or 24,000-mile warranty; free replacement if the coil fails within coverage.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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