6X38258P Yamaha 10-Pin Main Wiring Harness - 20 FT

The Pro Marine 6X38258P is a 20-foot Yamaha-style 10-pin main wiring harness for compatible Yamaha outboard conventional-control rigging systems.

This aftermarket harness provides the main electrical connection between compatible Yamaha outboards and the boat's conventional helm/control wiring. It is an aftermarket alternative to Yamaha 688-8258A-60-00 and the earlier 6X3-8258A-10-00 20-foot harness.

Product Information

• Pro Marine Part Number: 6X38258P
• Brand: Pro Marine
• Part Type: Main Engine Wiring Harness
• Harness Type: Yamaha 10-Pin
• Length: 20 FT
• Primary OEM Replacement: 688-8258A-60-00
• Earlier Yamaha Number: 6X3-8258A-10-00
• Application: Compatible Yamaha outboards using the conventional 10-pin main harness system

Important Fitment Note

This is specifically a 20 FT, 10-pin Yamaha main harness. Do not order based only on the Yamaha brand or engine horsepower.

Yamaha has used different main-harness connector styles, harness lengths, control systems, and rigging configurations. Confirm that your application uses the conventional Yamaha 10-pin main harness before ordering.

Also verify harness length. Several Yamaha part numbers in this harness family use the same general 10-pin configuration but are supplied in different lengths.

OEM and Cross Reference Numbers

The Pro Marine 6X38258P is the 20 FT aftermarket version of the Yamaha conventional 10-pin main harness.

What This Harness is Used For

The main wiring harness provides the electrical connection between a compatible Yamaha outboard and the boat's conventional helm/control electrical system.

On compatible Yamaha 10-pin systems, the harness carries the circuits required between the engine-side connection and the conventional control system at the helm.

This type of harness is commonly replaced during a repower, control-box replacement, complete boat re-rig, wiring restoration, or when the original harness has been damaged or corroded.

Compatible Applications

This listing should not be interpreted as fitting every Yamaha outboard. Yamaha fitment depends on the engine, control system, connector configuration, rigging generation, and harness length.

10-Pin Conventional Control Harness

This part is for Yamaha applications using the 10-pin conventional main harness.

It should not be confused with Yamaha digital electronic control, Command Link Plus DEC, or other harness systems that use different connectors and wiring arrangements. Compare your existing connectors and OEM number before ordering.

Common Replacement Reasons

• Original main harness has damaged, cut, or brittle wiring.
• Connector pins are corroded, bent, damaged, or missing.
• Electrical problems are traced to damage within the existing harness.
• Boat is being re-rigged with a compatible Yamaha conventional 10-pin control system.
• Existing harness is being replaced during an engine repower.
• Restoration of an older Yamaha rigging installation.
• A 20-foot harness length is required for the boat's engine-to-helm routing.

Installation Tips

• Disconnect battery power before servicing or replacing the engine wiring harness.
• Confirm both ends use the correct Yamaha 10-pin connector configuration before routing the harness.
• Compare the replacement harness with the original harness before installation.
• Route the harness away from sharp edges, moving steering components, excessive heat, and areas where water can collect.
• Do not stretch the harness tightly between the engine and helm.
• Allow enough movement at the engine end for normal steering and engine movement.
• Inspect mating connectors and terminals for corrosion or damage before connecting the new harness.
• Secure the harness properly to prevent chafing and vibration damage.

Key Features and Benefits

• Pro Marine Brand: Cost-effective aftermarket alternative to the Yamaha OEM harness.
• 20 FT Length: Designed for applications requiring the Yamaha 20-foot main harness.
• 10-Pin Configuration: For compatible Yamaha conventional-control rigging systems.
• OEM Replacement: Replaces Yamaha 688-8258A-60-00 applications.
• Earlier Number Coverage: Cross-references the earlier 6X3-8258A-10-00 20-foot harness.
• Rigging Replacement: Useful for re-rigging, repowers, restorations, and damaged-harness replacement.
• OEM Option Available: Genuine Yamaha 688-8258A-60-00 is also available from Pro Marine USA.

Frequently Asked Questions

What is Pro Marine 6X38258P?

6X38258P is a Pro Marine aftermarket 20-foot main wiring harness for compatible Yamaha outboards using the conventional 10-pin harness system.

How long is the 6X38258P harness?

It is a 20-foot harness.

How many pins does this Yamaha harness use?

This is a 10-pin main harness.

Does 6X38258P replace Yamaha 688-8258A-60-00?

Yes. 688-8258A-60-00 is Yamaha's 20-foot conventional 10-pin main harness and is the primary OEM counterpart for Pro Marine 6X38258P.

What happened to Yamaha 6X3-8258A-10-00?

Yamaha 6X3-8258A-10-00 is an earlier number associated with the 20-foot harness application and was superseded by 688-8258A-60-00.

Is 688-8258A-50-00 the same as this harness?

It is part of the related Yamaha 10-pin main-harness family, but it is approximately 16.4 feet long. The Pro Marine 6X38258P on this page is the 20-foot version.

Is 688-8258A-70-00 the same length?

No. Yamaha 688-8258A-70-00 is approximately 23 feet long. Verify the length required for your boat before choosing between harness versions.

Does this fit every Yamaha outboard with conventional controls?

No. Yamaha has used several harness and control configurations. Your engine and controls must use the compatible 10-pin main harness configuration.

Is this for Yamaha Command Link Plus digital controls?

No. This listing is for the conventional Yamaha 10-pin main harness. Digital electronic control and Command Link Plus systems can use different harnesses and connector configurations.

Should I order by horsepower?

No. For an electrical rigging component such as this, confirm the connector type, control system, original part number, and required harness length rather than ordering by horsepower alone.

Is a genuine Yamaha OEM version available?

Yes. Pro Marine USA also carries the genuine Yamaha 688-8258A-60-00 20 FT wiring harness .

How do I know whether 20 feet is long enough?

Measure the required routing distance from the engine to the helm using the path the harness will actually follow. Allow sufficient routing length for bends, secure mounting, and normal engine steering movement.

Searchable Part Numbers

6X38258P, 6X3-8258A-10-00, 688-8258A-60-00, 6X3-8258A-00-00, 688-8258A-50-00, 688-8258A-70-00, 6X38258A1000, 6888258A6000, 6X38258A0000, 6888258A5000, 6888258A7000

Searchable Terms

Yamaha 10 pin harness, Yamaha 10-pin main harness, Yamaha 20 foot wire harness, Yamaha 20 ft wiring harness, Yamaha outboard main harness, Yamaha engine to control harness, Yamaha conventional control harness, Yamaha rigging harness, Yamaha remote control wiring harness, Yamaha engine wiring harness, 688-8258A-60-00 replacement, 6X3-8258A-10-00 replacement, Pro Marine 6X38258P, aftermarket Yamaha harness, Yamaha boat wiring harness, 10 pin outboard harness