Mercury MerCruiser Quicksilver Mercathode Controller 8M0100517
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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Alternate & Superseded Part Numbers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.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.