Mercury Quicksilver Relay Assembly 882751A04 | Verado FourStroke MerCruiser Zeus
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Electrical Relay Assembly — Part 882751A04
| Part Number | 882751A04 |
|---|---|
| Brand | Mercury Marine / Quicksilver |
| Official Product Type | Electrical Relay Assembly |
| System | Electrical — Engine and Control System Circuits |
| Aftermarket Cross-Reference | Sierra 18-5850, ARCO R751, Recmar REC882751A04 |
| UPC / GTIN | 745061637856 |
This is the genuine OEM relay assembly used across a wide range of Mercury outboard, MerCruiser inboard/sterndrive, and Zeus Joystick Piloting systems. The same part number appears in multiple electrical-box positions depending on model and application — which means serial-number and diagram verification is essential before ordering. Matching by appearance or horsepower alone is not sufficient.
Part Number Reference
- OEM number: 882751A04
- Aftermarket: Sierra 18-5850, ARCO R751, Recmar REC882751A04
Compatible Applications
Fitment varies by electrical-box position, model, and serial number. Confirm against the serial-number-specific electrical or fuse-box diagram before ordering. Do not select by horsepower or appearance alone.
Mercury Outboard — FourStroke & EFI
- 30–300 HP FourStroke — selected applications
- EFI and SCi outboard applications — selected models
Mercury Verado & Pro Verado
- 200 / 225 / 250 / 275 HP Verado — selected applications from 2005 model year
- 350 SCi Verado — selected applications
- 400 Verado — selected electrical-box assemblies
- Pro Verado and Racing — selected applications
MerCruiser
- MCM 496 — selected sterndrive applications
- MIE 8.1L — selected inboard applications
- 8.1L TowSport — selected applications
Zeus Joystick Piloting
- Zeus Joystick Piloting Design I — selected applications
- Zeus Joystick Piloting Design II — selected applications
When This Part Needs Replacement
- The relay fails electrical continuity or switching tests
- An affected circuit operates intermittently or not at all
- The relay shows visible heat damage, melting, or corrosion at the terminals
- Terminals are oxidized or physically damaged
- The relay fails to energize when commanded
- A known-good relay substituted in the same socket confirms the fault
Note: multiple identical-looking relays are often installed in the same electrical box. Identify the circuit position in the diagram before replacing any relay.
Related Parts
- 804352 — Relay/fuse-block mounting clip (search by part number)
- 831960 — Fuse cover (search by part number)
- 858754 — Fuse cover (search by part number)
- 865827T — Electrical component / module used in related assemblies (search by part number)
- 865639T — Bracket (search by part number)
Installation Notes
- Disconnect battery power before beginning any electrical service
- Identify the exact circuit position for this relay in the applicable electrical diagram before removal
- Inspect the relay socket for heat damage or corrosion — a damaged socket can cause repeat relay failure
- Ensure terminals are clean and the replacement relay is fully seated
- Check the related fuse and wiring for the affected circuit if the original relay failed prematurely
- Follow the applicable Mercury service manual for circuit testing and diagnosis
Parts Desk Insights
Most common customer issue: Ordering this relay based on the engine model or horsepower without confirming the circuit position in the electrical diagram. Mercury uses 882751A04 in multiple positions across several systems — Verado electrical boxes, MerCruiser big-block applications, and Zeus Joystick systems all use the same relay in different roles. If the wrong circuit is diagnosed or the relay is installed in the wrong position, the underlying fault won’t be fixed. Always confirm the schematic position first.
Best use case: Direct OEM service replacement for a confirmed failed relay in the applicable electrical box. If you’re troubleshooting an intermittent electrical issue, substituting a known-good relay of the same part number into the suspect socket is a quick and effective diagnostic step before replacing anything permanently.
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.