Mercury MerCruiser Switch Assembly 88031 | OEM Electrical Control
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Mercury MerCruiser Switch Assembly 88031
Part Number: 88031 | Also listed as: 87-88031
Brand: Mercury / MerCruiser / Quicksilver
Official Product Type: Switch Assembly — OEM Electrical Control
System: Engine Electrical / Control Assembly
Diagram Position: Confirm exact location in the Mercury electrical or control assembly diagram for your specific engine model and serial number
A genuine OEM Mercury MerCruiser switch assembly for applicable Mercury and MerCruiser engines and control assemblies. The 87- prefix in the Mercury catalog format identifies this as an electrical switch or control component. Switch assemblies in the Mercury lineup cover a range of functions — including ignition, trim/tilt, choke, and panel controls — and are critical to reliable engine and drive operation. Always confirm the correct part number against the Mercury parts diagram for your specific engine before ordering.
Compatible Applications
- Mercury and MerCruiser engines and control assemblies where part number 88031 / 87-88031 is specified in the parts diagram
- Confirm fitment by engine model, serial number, and the Mercury electrical or control assembly diagram before ordering
Switch assembly fitment is engine-family and serial-number specific. Always verify part number 88031 against the Mercury parts diagram for your exact engine or control assembly — similar switch assemblies can differ in connector configuration, function, and mounting.
Part Details
- Component type: Switch assembly — OEM electrical control
- Mercury catalog prefix: 87- (electrical switches and controls)
- Function: Controls an electrical circuit within the engine or control assembly — confirm specific function (ignition, trim, panel, or other) in the Mercury diagram for your application
- OEM status: Genuine Mercury MerCruiser — not aftermarket
- Diagram position: Confirm location and function in the Mercury electrical or control assembly diagram for your engine model and serial number
When to Replace
- Switch fails to make or break the circuit reliably — intermittent operation or no response
- Visible corrosion, burning, or physical damage to the switch body or contacts
- Water intrusion into the switch assembly causing corrosion-related failure
- Switch confirmed as faulty during electrical diagnosis
- Called out for replacement in the Mercury service manual during control assembly service
Installation Notes
- Disconnect the battery before working on any switch or electrical assembly.
- Photograph or note the existing wiring connections before removal.
- Match the replacement switch by part number — do not substitute based on appearance alone.
- Ensure all connectors are fully seated and secure after installation.
- After installation, reconnect the battery and verify correct switch function before returning the engine to service.
Technical FAQ
Q: How do I confirm this is the correct switch for my engine or control?
A: Locate part number 88031 / 87-88031 in the Mercury electrical or control assembly diagram for your specific engine model and serial number. Switch assemblies are position- and function-specific — the diagram is the only reliable way to confirm the correct part before ordering.
Q: Can I test the switch before replacing it?
A: Yes. Most switch assemblies can be tested with a multimeter for continuity in the on and off positions. Refer to the Mercury service manual for the correct test procedure and specifications for your application before condemning the switch.
Parts Desk Insights
Best use case: This is the right part when 88031 is confirmed in the Mercury parts diagram for the engine or control assembly being serviced, and the existing switch has been diagnosed as faulty. Switch assemblies at this price point are typically multi-function or panel-mounted assemblies rather than simple single-pole switches — confirming the exact part number before ordering avoids a costly return.
Common issues: The most frequent issue is ordering a switch assembly by function description (e.g., “trim switch” or “ignition switch”) without confirming the part number against the Mercury diagram — Mercury uses many different switch assemblies across engine families and production years, and they are not interchangeable. A second common issue is water intrusion into the switch housing on older engines; if the switch has failed due to corrosion, inspect the surrounding wiring and connectors for damage before installing the replacement.
Related Parts
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
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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.
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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:
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