MERCURY 56938 Gm Stern Drive Diode

( Manufacturer Part Number: 56938 ), ( Part Type: Drive )

Review MERCURY Gm Stern Drive Diode Trio fits MERCRUISER 1977-89

The Mercury 56938 Mercruiser GM Stern Drive Diodes are essential components for the ignition system of Mercury outboard motors manufactured between 1977 and 1989. These diodes are specifically designed for Mercury's GM series stern drive applications and are crucial for delivering the correct electrical charge to the spark plugs during the compression stroke.

The Mercury 56938 diodes are robustly built to withstand the harsh marine environment. They are constructed with high-quality materials, including a heavy-duty epoxy coating that protects them from water, corrosion, and other damaging elements. The diodes are also designed with a high-temperature rating to ensure reliable operation even in the most demanding conditions.

Each diode is a compact, rectangular component that measures approximately 2.5 inches long, 1.5 inches wide, and 0.5 inches thick. They have three terminals: two for the primary circuit and one for the secondary circuit. The primary circuit terminals are labeled with a " " and "-" symbol, indicating the positive and negative connections, respectively. The secondary circuit terminal is labeled with a "C" symbol, representing the spark plug connection.

The Mercury 56938 diodes operate based on semiconductor technology, allowing them to convert alternating current (AC) to direct current (DC) efficiently. They are capable of handling high current loads and can deliver a reliable spark to ignite the fuel-air mixture in the combustion chamber.

It's important to note that these diodes should only be installed and serviced by a qualified marine technician to ensure their proper function and to avoid potential electrical hazards. Additionally, regular maintenance, such as checking for signs of corrosion or damage, can help prolong the lifespan of these vital components and maintain the overall performance and reliability of the outboard motor.

Mercury 56938 Mercruiser GM Stern Drive Diode (1977-1989): Pros, Cons, and Conclusion

The Mercury 56938 Mercruiser GM stern drive diode, designed for use in Mercury outboard motors from 1977 to 1989, is an essential component for maintaining the proper functioning of the electric system. In this analysis, we will discuss the advantages, disadvantages, and a final recommendation regarding the Mercury 56938 Mercruiser GM stern drive diode.

1. High-quality component: The Mercury 56938 is a high-quality diode manufactured by a well-established brand, ensuring durability and reliability.

2. Essential for charging system: This diode is crucial for the charging system in Mercury outboard motors, ensuring the battery is adequately charged for optimal engine performance.

3. Compatibility: The Mercury 56938 is specifically designed for Mercury outboard motors from 1977 to 1989, ensuring a perfect fit and function.

1. Availability: Due to its age, this diode can be challenging to find and purchase from authorized Mercury dealers or retailers.

2. Compatibility with non-Mercury motors: The Mercury 56938 is not compatible with non-Mercury outboard motors, limiting its versatility for boat owners.

3. Cost: Compared to modern diodes, the Mercury 56938 can be more expensive due to its age and scarcity.

The Mercury 56938 Mercruiser GM stern drive diode is a critical component for Mercury outboard motor owners from the 1977 to 1989 era. Its high-quality manufacturing and essential role in maintaining the charging system make it a valuable investment. However, its limited availability, compatibility with only Mercury motors, and higher cost compared to modern diodes may deter some boat owners.

For Mercury outboard motor owners from 1977 to 1989, it is highly recommended to replace the Mercury 56938 stern drive diode as soon as possible if it is no longer functioning correctly. While its scarcity and cost may be a concern, the importance of a properly functioning charging system cannot be overstated. It is advised to contact authorized Mercury dealers or retailers for availability and pricing information.

Details:

This Is Guaranteed!!, Jess-664. Brand: Mercury. This part is from old stock. New OEM part.

Condition: New Other. This sale is for a new diode trio Mercruiser stern drives. The Mercury part number is 56938, This diode trio should fit some Mercruiser GM engines between 1977 and 1989. It does not have any packaging.

part #: 56938 prices

• $14.99-$16.49

specifications otsterndriv:

• for models: Mercruiser
• for makes: Mercury
• for years: 1977-89
• mpn: 56938
• part type: Drive

returns otsterndriv:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

shipping otsterndriv:

• type: Fixed
• class: Standard, Expedited
• cost: $0.00
• carrier: USPS
• service: Standard, USPS Priority Mail
• transit: 4-7 Days

general otsterndriv:

• condition: New other see details
• Boat Parts > Sterndrive Motors Components > Other

payments otsterndriv:

• other
• wallet: Google-pay
• credit card: Mastercard

offer otsterndriv:

• best offers: True
• sold: 0
• started: May 7, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 1

seller otsterndriv:

• rating: 99.8%
• city: Green Bay, Wisconsin
• # reviews: 29944

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