Cdi Electronics Mercury Adp. Harness (421-4401)
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The Mercury ADP. HARNESS (421-4401) is a high-quality adapter harness for Mercury engines and made with the finest materials in the industry. It's a system of wires, cables, connectors, and terminals that distributes electrical power and control data to remote components and adapts older Mercury engines with side cowling connections to the modern 8-pin plug.
CDI Electronics excels in all types of high-quality marine products that have proven to be of excellent quality performance.
Key features:
- Top-quality Mercury engine adapter harness
- 100% Brand new and made with the highest-quality materials in the industry
- OEM Style Harnesses with High-Performance Quality
- Harness meets or exceeds OEM specifications.
- Built to perform.
- Compact. Easy to carry, store and install.
- Designed to provide convenience and comfort
- It has been proven and tested for its exceptional dependability throughout the manufacturing process.
- Approve marine-grade product
Specifications:
- Brand: CDI Electronics
- Condition: Brand New
- Item Number: 421-4401
- Weight: 3.30 LBS
Note:
- For marine applications
Adapts older Mercury engines with side cowling connection to new 8 pin plug
This product replaces:
- 667-4214401, 736983854667, 84-93669A2, 93669A2
Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.
Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.
Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.
Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.
Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.
Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.
To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.
We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.