Sierra 18-99328 Ignition Coil Primary Wire Set for Mercury Mariner L6 Outboard Engines

The Sierra 18-99328 Ignition Coil Primary Wire Set is built for Mercury Mariner inline six-cylinder (L6) outboard engines, supplying the primary-circuit wiring that connects the ignition coils into the engine's ignition system. As engine wiring ages, insulation can crack and connections can loosen or corrode, leading to weak spark, misfires, or hard starting; replacing the primary wire set restores a clean, consistent electrical path between the coil and the rest of the ignition circuit. This set is sized and configured specifically for L6 outboard applications, so it installs in place of the factory wiring without modification. Sierra is a long-established name in marine replacement parts, and this wire set is manufactured to work as a direct functional replacement in the ignition system it is designed for. At just 0.15 pounds, it is a lightweight, straightforward component that a boat owner or marine technician can install during routine ignition maintenance or when troubleshooting an ignition fault on a Mercury Mariner L6 outboard. Keeping the primary wiring in good condition is a simple way to help maintain reliable starting and smooth running.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99328
• Product Type: Ignition Coil Primary Wire Set
• Engine Configuration: L6 (inline six-cylinder)
• Application: Mercury Mariner outboard engines
• UPC: 736983856883
• Weight: 0.15 pounds

Frequently Asked Questions

What is the Sierra 18-99328 ignition coil primary wire set used for? It supplies the primary-circuit wiring that connects the ignition coils on Mercury Mariner L6 (inline six-cylinder) outboard engines, part number 18-99328.

Which engines does the 18-99328 wire set fit? The 18-99328 primary wire set is configured for Mercury Mariner L6 outboard engines, meaning inline six-cylinder Mercury Mariner outboards.

How much does this ignition coil wire set weigh? The Sierra 18-99328 primary wire set weighs 0.15 pounds.

Is the Sierra 18-99328 a genuine Sierra part? Yes, 18-99328 is a Sierra brand part number, manufactured as a replacement ignition coil primary wire set for Mercury Mariner L6 outboards.

When should I replace the ignition coil primary wire set? If a Mercury Mariner L6 outboard is showing weak spark, misfires, or hard starting and the primary ignition wiring shows cracked insulation or corroded connections, replacing the wire set with the Sierra 18-99328 can restore a clean electrical connection.

Does installing the 18-99328 require modifying the engine wiring? No, the Sierra 18-99328 is sized and configured for Mercury Mariner L6 outboard applications so it installs in place of the factory primary wiring.

What is the UPC for the Sierra 18-99328 wire set? The UPC for the Sierra 18-99328 ignition coil primary wire set is 736983856883.

Does the 18-99328 include the ignition coils themselves? No, 18-99328 is the primary wire set only, used to wire the ignition coils on a Mercury Mariner L6 outboard, not the coils themselves.

Is this wire set suitable for a technician doing ignition troubleshooting? Yes, the lightweight Sierra 18-99328 primary wire set is a straightforward component for a technician to install while diagnosing or servicing the ignition system on a Mercury Mariner L6 outboard.

What brand is part number 18-99328? Part number 18-99328 is manufactured by Sierra, a supplier of marine replacement parts, as an ignition coil primary wire set for Mercury Mariner L6 outboard engines.