858914T1 Mercury Harness | Genuine Used Part

🔧 Product Description

Genuine Mercury Harness Assembly - Part Number: 84-858914T1

A genuine Mercury harness assembly used on selected Mercury four-stroke and EFI four-stroke outboards. This harness is part of the engine electrical loom and must be matched by the exact serial-numbered Mercury parts diagram and connector layout.

⚙️ Key Features

• Genuine Mercury harness assembly

• Correct OEM part number 84-858914T1

• Used on selected 75HP to 115HP Mercury four-stroke outboards

• Supports carbureted four-stroke and EFI four-stroke applications

• Must be matched by serial range and plug configuration

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 84-858914T1 current Mercury harness reference

OEM / Related Numbers:

• 858914T1

• 84-858914T1

• 858914-T1

• Harness assembly

• UPC: 745061443785

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Mercury 75HP / 90HP four-stroke outboards

• Mercury 75 EFI / 80 EFI / 90 EFI / 100 EFI / 115 EFI four-stroke outboards

Typically suits:

• Mercury 75HP 4-Stroke - serial 0G960500 to 0T800999

• Mercury 75HP 4-Stroke - serial 0T801000 to 1B226999

• Mercury 75HP 4-Stroke Bodensee - serial 0G960500 to 0T800999

• Mercury 75HP 4-Stroke Bodensee - serial 0T801000 to 1B226999

• Mercury 75 EFI 4-Stroke - serial 1B172291 to 1B366822

• Mercury 80 EFI 4-Stroke - serial 1B227000 to 1B366822

• Mercury 90HP 4-Stroke - serial 0G960500 to 0T800999

• Mercury 90HP 4-Stroke - serial 0T801000 to 1B226999

• Mercury 90 EFI 4-Stroke - serial 1B172291 to 1B366822

• Mercury 100 EFI 4-Stroke - serial 1B227000 to 1B366822

• Mercury 115 EFI 4-Stroke - serial 0T178500 to 0T800999

• Mercury 115 EFI 4-Stroke - serial 0T801000 to 1B226999

• Mercury 115 EFI 4-Stroke - serial 1B227000 to 1B366822

• HP Range: 75HP / 80HP / 90HP / 100HP / 115HP

• Engine Type: Mercury four-stroke and EFI four-stroke outboard

• Year Range: Serial-number controlled

• Serial Note: Confirm serial number and harness connector layout before installation.

🔌 Function

The harness assembly carries power, ground and signal wiring between engine electrical components. It supports reliable communication between sensors, relays, ignition/EFI components and the engine control wiring.

Common signs of failure:

• Intermittent engine electrical faults

• No-start or random cut-out condition

• Sensor or EFI fault codes caused by broken wiring

• Corroded connector terminals

• Broken plug locks or damaged insulation

• Electrical fault changes when the harness is moved

• Poor charging, relay or warning-circuit operation

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated