Sierra Ignition Coil Primary Wire Set for Mercury Mariner 4-Cylinder Outboards - 18-99277

The Sierra 18-99277 is a primary wire set designed for the ignition coils on Mercury Mariner 4-cylinder outboard engines. Primary wires carry low-voltage current from the ignition system to the coil, and a worn, cracked, or corroded primary wire can cause misfires, hard starting, or an inconsistent spark. This wire set is built to restore a reliable low-voltage connection at the coil, helping keep the ignition system firing correctly cylinder to cylinder.

It is manufactured for Mercury Mariner 4-cylinder outboard applications and is intended as a direct replacement for the factory primary wiring at the ignition coil. Replacing primary wires along with other ignition components is a straightforward way to rule out wiring as the source of an ignition-related running problem before assuming a coil or other ignition part has failed.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99277
• Product Name: Ignition Coil Primary Wire Set - 4 Cyl.
• Application: Mercury Mariner outboard ignition coils, 4-cylinder engines
• Weight: 0.14375 pounds
• UPC: 808282395216

Fitment

Fits Mercury Mariner 4-cylinder outboard engines using this ignition coil primary wiring.

Frequently Asked Questions

What is the Sierra 18-99277 used for? The Sierra 18-99277 is a primary wire set for the ignition coils on Mercury Mariner 4-cylinder outboard engines, carrying low-voltage current from the ignition system to the coil.

Will this wire set fit a Mercury Mariner outboard with a 6-cylinder engine? No, the Sierra 18-99277 is built specifically for 4-cylinder Mercury Mariner outboard engines and is not intended for 6-cylinder applications.

How much does the 18-99277 wire set weigh? The Sierra 18-99277 ignition coil primary wire set weighs 0.14375 pounds.

What are the symptoms of a bad ignition coil primary wire? A failing primary wire on a Mercury Mariner ignition coil can cause misfires, hard starting, or inconsistent spark, since the wire carries the low-voltage current that triggers the coil.

Is the Sierra 18-99277 a direct replacement for the factory primary wiring? Yes, the 18-99277 is manufactured as a replacement primary wire set for the ignition coils on Mercury Mariner 4-cylinder outboards.

What brand makes part number 18-99277? Part number 18-99277 is manufactured by Sierra as an ignition coil primary wire set for 4-cylinder Mercury Mariner outboards.

Does replacing the primary wire set require replacing the ignition coil itself? No, the Sierra 18-99277 replaces only the primary wiring at the coil; it does not include the ignition coil itself.

Can a bad primary wire be a cheaper fix than replacing the ignition coil? Checking and replacing the primary wire, such as the Sierra 18-99277, is a reasonable first step before replacing an ignition coil, since a damaged wire can mimic coil-failure symptoms on a Mercury Mariner outboard.

What engine cylinder count is the 18-99277 designed for? The Sierra 18-99277 is designed specifically for 4-cylinder Mercury Mariner outboard engines.

What is the UPC for the Sierra 18-99277 wire set? The UPC for the Sierra 18-99277 ignition coil primary wire set is 808282395216.