858723T1 Mercury Harness | Genuine Used Part

🔧 Product Description

Genuine Mercury Harness Assembly - Part Number: 84-858723T1

A genuine Mercury harness assembly used on selected Mercury 75HP to 115HP four-stroke and EFI four-stroke outboards. This harness must be matched by exact serial range and connector layout before installation.

⚙️ Key Features

• Genuine Mercury harness assembly

• Correct OEM part number 84-858723T1

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

• Supports EFI and non-EFI four-stroke electrical layouts

• Must be matched by serial-numbered parts diagram

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 84-858723T1 current Mercury harness reference

OEM / Related Numbers:

• 858723T1

• 84-858723T1

• 858723-T1

• Harness assembly

• UPC: 745061443099

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 plug layout before installation.

🔌 Function

The harness assembly carries engine electrical power and signal circuits between sensors, control components, relays and engine wiring junctions.

Common signs of failure:

• Intermittent no-start or cut-out

• EFI or sensor faults caused by damaged wiring

• Corroded plug terminals

• Broken locking tabs

• Warning horn or gauge faults

• Fault changes when harness is moved

• Damaged insulation or previous repair joins

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated