Mercury MerCruiser Quicksilver Mercathode Controller 8M0100517

Mercury MerCruiser MerCathode Controller Sterndrive Corrosion Protection

Part Number: 8M0100517 | GTIN: 745061921214
Brand: Mercury / MerCruiser | Type: MerCathode Electronic Control Unit (Gen III, Black with Red Decal)

Genuine Mercury MerCruiser OEM MerCathode controller for selected sterndrive applications. The MerCathode system is an impressed-current corrosion-protection system that actively helps protect underwater drive components from galvanic corrosion. This controller is the electronic control module that regulates the system it is not the sacrificial anode or the complete MerCathode kit. Supersedes 8M0082462.

Compatible Applications

• MerCruiser R sterndrive MerCathode-equipped installations
• MerCruiser MR sterndrive MerCathode-equipped installations
• MerCruiser Alpha One sterndrive MerCathode-equipped installations
• MerCruiser Alpha One Gen II sterndrive MerCathode-equipped installations
• MerCruiser Bravo sterndrive MerCathode-equipped installations

Confirm drive type and existing MerCathode system configuration before ordering. This controller is only compatible with active impressed-current MerCathode installations not all sterndrive engines are MerCathode-equipped. Do not select by engine displacement alone.

When This Part Needs Replacement

Replace the controller when MerCathode system diagnosis indicates the control module has failed, when the system is no longer producing the correct corrosion-protection output, or when the controller or wiring has been physically or electrically damaged.

Installation Notes

Before replacing the controller, inspect the complete MerCathode system wiring harness, reference electrode, anode, grounds, and all electrical connections. Corrosion-protection problems can result from wiring, grounding, or electrode issues as well as from controller failure. Verify correct system operation after installation using the applicable Mercury MerCruiser service procedure.

Alternate & Superseded Part Numbers

• Current OEM: 8M0100517
• Supersedes: 8M0082462
• GTIN: 745061921214

Parts Desk Insights

The most important clarification with 8M0100517 is that it is the electronic MerCathode controller only not the anode, electrode, or a complete kit. Customers troubleshooting corrosion-protection issues should test the controller, reference electrode, anode, wiring, and grounding as a complete system before ordering. A common mistake is replacing the controller when the actual issue is a failed electrode or poor ground connection. Also note that not all MerCruiser sterndrive boats are equipped with MerCathode confirm the system is installed before ordering this part.