Item Description
85892 817255 Mercury Quicksilver Side Mount Control Box with 15-ft Harness
OEM Origin & Identification
Brand/Model: Vintage Mercury Quicksilver Side-Mount Remote Control Box (Compatible with classic Mercury outboards).
Identification: Internal aluminum housing features OEM casting numbers 85892 and cross-references with 817255.
Application & Fitment Warning
Compatibility: Fits classic Mercury and Mariner outboards utilizing a 15 ft harness and standard 8-pin plug.
⚠️ Fitment Warning: Please carefully compare your existing control box, 8-pin plug configuration, and internal layout with all listing photos to ensure an exact match before purchasing.
Component Details & Condition
Condition: Fully serviced, thoroughly tested, and in great working condition.
Switches & Electronics: Features a brand-new key switch in place. Any wires that had to be cut in order to service the key switch were soldered together or pinned, then sprayed with a rubberized spray to protect the key switch and its wiring. Neutral safety switch, kill switch, tilt/trim switches, and trailering button have all been tested and verified fully functional.
Note on Trim Testing: Power trim and tilt functions cannot be accurately evaluated via a simple bench test; the wiring harness must be fully plugged in and powered with 12V. For precise electrical verification, test continuity/voltage using the brown wire as the hot supply, checking sequentially from the brown wire to the green, purple, and blue circuits.
Wiring: Professionally serviced. The 15 ft boat-side harness and 8-pin plug are in good condition. Note: The 4 lower trim/tilt wires required trimming due to minor dry rot/sun cracking, leaving plenty of clean wire length ready for new terminal additions.
Hardware: Brand-new key switch installed (chokes and fires the motor properly). Newly added handle shift lock-out button installed (OEM Casting # 93487). Freshly greased and shifts smoothly into forward, neutral, and reverse.
What’s Included
Fully serviced Mercury Quicksilver side-mount control box housing (Casting #'s 85892 / 817255)
15 ft boat-side wiring harness with 8-pin plug
Built-in handle tilt/trim and trailering switches
Brand-new installed key switch with key
Newly installed handle shift lock-out button (Casting # 93487)
