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Plug Wire Set - Sierra Marine Engine Parts - 18-8821-1 (118-8821-1)

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2.01 LBS
Unit of Measure:
Alternate Products SKU:
"816761Q3", "18-8821-1"
Manufacturer Part Number (MPN):

Plug Wire Set - Sierra Marine Engine Parts - 18-8821-1 (118-8821-1)


The spark plug wire transports a high-voltage current from the ignition coil to the spark plug. These wires are extensively insulated to keep the extremely high voltage current from escaping by arcing across the powerhead or any other grounded metal it can find. Any voltage loss along the spark plug wires results in a decrease of spark strength from the plug itself. Sea Star Solutions' plug wire set comprises eight spark plug wires and coil wire. It is the Thunderbolt Ignition Type, which is the most suitable for Mercruiser.

Key Features:

  • This product also replaces 47-8821-1, 47-88211, 80828219449, 808282194499, 84-813720Q3, 84-813720Q4, 84-816761A17, 18-8821, AP3040
  • Kevlar core for optimum durability and extended life, as well as a long-lasting stainless steel wound conductor for optimal horsepower and engine performance
  • Premium silicone jacketing and boots provide the utmost heat protection
  • RFI suppression is at its best for the most sensitive electronic equipment
  • Mercruiser Stern Drive interchangeable (84-813720A3, 84-813720A4, 84-816761A17, 84-816761A4, 84-816761Q17, 84-816761Q3, 84-816761Q4)


  • BRAND: Sea Star Solutions
  • SKU: 18-8821-1
  • UPC: 808282194499
  • WEIGHT: 2.01 LBS

Ignition Type: Thunderbolt 8 cyl, Contains: 8 Spark Plug Wires and Coil Wire. Kevlar Core, Stainless Steel Wound Conductor, Silicone Jacketing and Boots

This product replaces:

    47-8821-1, 47-88211, 80828219449, 808282194499, 84-813720Q3, 84-813720Q4, 84-816761A17, 18-8821, AP3040


We can ship to virtually any address in the US. 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.

Returns 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, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.

Need help? We're available at+1 (800) 664-8116 - Email us
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