ARCO Marine Starters & Alternators

When an engine will not crank or charge

When an engine will not crank or charge, ARCO Marine is the go-to for replacement starters, alternators, and ignition components. ARCO builds marine-grade, ignition-protected parts engineered to replace the original equipment piece on inboard and outboard engines. This collection covers high-output starters, alternators, distributor caps, and solenoids. The single most important thing when ordering is matching the part to your exact engine, especially rotation direction on a starter.

Get starter rotation right

Marine starters spin clockwise or counterclockwise depending on the engine, and the wrong rotation will not turn the motor over. ARCO lists the rotation, tooth count, and engine fitment for each starter, so confirm your engine make, model, and rotation before ordering. Many high-performance starters add gear reduction for more cranking torque and a lighter spin, which helps high-compression engines start. Always verify the direction your engine requires because a mismatch prevents the starter from engaging the flywheel correctly.

Match the alternator to your charging needs

Alternators are rated by amperage output, and a bigger house bank or more electronics calls for more output. Match the amperage, mounting foot, and pulley to your engine, and make sure the alternator is marine ignition protected so it cannot spark in an engine compartment. ARCO offers higher-output upgrades for boats that run a lot of accessories. Proper output prevents battery drain during long days on the water and keeps electronics running without issues.

Ignition components

Distributor caps, rotors, and related ignition parts wear and crack with heat and age, which causes hard starts and misfires. ARCO offers marine-grade replacements matched to specific engines, so confirm the engine and ignition type before ordering. Marine ignition parts are built to resist corrosion and meet ignition-protection rules, unlike automotive parts. Regular inspection of these components helps avoid breakdowns far from shore.

Inboard or outboard

ARCO covers both inboard and sterndrive starters and alternators as well as outboard starters for major brands. Inboard starters often bolt to a GM or Ford-based block, while outboard starters are specific to the motor brand and family. Match the part to your platform, not just the brand of boat. Different mounting styles and wiring mean the correct platform choice is essential for a clean install.

Confirm fitment before you buy

Cross-reference the OEM number when you have it, or use the engine make, model, year, and rotation to find the right part. A starter or alternator that is close but not exact will not bolt up or spin correctly. Not sure which ARCO part your engine needs? Give our crew your engine make, model, year, and the OEM number if you have it, and we will match the starter rotation, alternator output, or ignition part so it bolts up and cranks.