# 8712886A6 Mercury MerCruiser Switch Assembly | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Oil Sensor Switch Assembly - Part Number: 87-12886A6

  

A genuine Quicksilver oil sensor switch assembly used on selected Mercury and Mariner 2-stroke oil-injected outboards. This switch monitors oil level or oil system condition in the engine-mounted oil tank system and forms part of the warning circuit.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM oil sensor switch assembly

• Correct Mercury part number 87-12886A6

• Used on selected Mercury / Mariner 30HP to 250HP 2-stroke outboards

• Common oil bottle / oil tank switch application

• Cross-referenced with Sierra 18-1800 service reference

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 87-12886A6 current OEM oil sensor switch reference

• 87-12886A related earlier switch family reference

  

OEM / Related Numbers:

  

• 87-12886A6

• 12886A6

• 8712886A6

• 87-12886A

• 12886A

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-1800

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner oil-injection oil bottle switch applications

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 30HP 2-stroke oil-injected applications where 87-12886A6 is specified

• Mercury / Mariner 40HP 2-stroke oil-injected applications where 87-12886A6 is specified

• Mercury / Mariner 50HP 2-stroke oil-injected applications where 87-12886A6 is specified

• Mercury / Mariner 60HP 2-stroke oil-injected applications where 87-12886A6 is specified

• Mercury / Mariner Jet oil-injected applications using switch 87-12886A6

• Mercury / Mariner Marathon oil-injected applications using switch 87-12886A6

• Mercury / Mariner SeaPro oil-injected applications using switch 87-12886A6

• Mercury / Mariner BigFoot oil-injected applications using switch 87-12886A6

• Mercury / Mariner EFI 2-stroke oil-injected outboards requiring 87-12886A6

• Mercury / Mariner carbureted 2-stroke oil-injected outboards requiring 87-12886A6

• Mercury / Mariner 30HP to 250HP 2-stroke oil-injection applications where specified

  

• HP Range: 30HP - 250HP

• Engine Type: Mercury / Mariner 2-stroke oil-injected outboard

• System Type: Oil tank sensor switch / warning circuit

  

🔌 Function

  

The switch detects oil level or oil tank condition and sends a signal to the warning system when the oil level or circuit condition requires attention.

  

Common signs of failure:

  

• False oil warning alarm

• No alarm when oil level is low

• Intermittent warning signal

• Oil tank switch fails continuity test

• Corroded terminals or damaged float / switch assembly

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 47.45 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 47.45 AUD | In stock |

## Images

- 8712886A6 Mercury MerCruiser Switch Assembly | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/8712886a6-mercury-mercruiser-switch-assembly-genuine-quicksilver-oem-part)
> Updated: 2026-05-17