858740T4 Mercury Harness | Genuine Used Part
858740T4 Mercury Harness | Genuine Used Part
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🔧 Product Description
Genuine Mercury Harness Assembly - Part Number: 858740T4
A genuine Mercury harness assembly used as an adapter harness in Mercury to Yamaha-style rigging / electrical conversion applications. This harness links compatible Mercury engine or control-system connectors to the matching Yamaha-style connection layout where the 858740T4 harness is specified.
⚙️ Key Features
- Genuine Mercury harness assembly
- Correct Mercury part number 858740T4
- Adapter harness for Mercury to Yamaha-style connection applications
- OEM Mercury factory harness assembly
- Fitment depends on plug type, engine rigging and control-system layout
🚤 Compatibility
Commonly used on
- Mercury to Yamaha adapter harness installations
Typically suits
- Engine / rigging applications:
- Mercury engine installations requiring Yamaha-style adapter connection
- Mercury 14-pin to Yamaha-style rigging conversion applications where 858740T4 is specified
- Mercury remote-control or instrumentation conversion setups using 858740T4
- Mercury / Yamaha shared rigging interface applications matched by plug layout
- HP Range: rigging-dependent
- Engine Type: Mercury outboard rigging harness system
- System Type: Adapter harness assembly
- Serial Note: Harness fitment is plug- and rigging-specific. Match by exact engine serial number, control type, connector count and pin layout.
🔌 Function
The harness adapts electrical control or instrumentation circuits between compatible Mercury and Yamaha-style plug systems.
⚠️ Common Signs of Failure
- No communication between control harness and engine
- Intermittent gauge or warning function
- Trim, start or key-switch circuit not operating
- Corroded or damaged pins
- Broken wire continuity inside harness
- Fault changes when harness is moved
- Incorrect adapter harness fitted to rigging system
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 858740T4 current / listed Mercury harness assembly reference
OEM / Related Numbers
- 858740T4
- 84-858740T4
- 858740
- Mercury to Yamaha adapter harness reference
- Related rigging harness family reference
Aftermarket / Verified Equivalents
- No aftermarket equivalent
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day returns — if it's not right or you ordered the wrong part, tell us within 14 days of delivery and send it back in the condition you received it (return freight is at your cost; fitted parts can't be returned). Used parts are sale items, so a return may be limited to store credit. Full details in our Refunds & Returns policy.
What you get with this used part
What you get with this used part
- A genuine part removed from an engine, drive or jet ski dismantled in our Kadina workshop, inspected before listing. The photos show the actual part on our shelf.
- A 14-day return period if it is not right or you ordered the wrong part.
- Used gearboxes are pressure-tested before dispatch and carry a 30-day repair warranty. Propellers are sold as-is and priced accordingly.
- Not sure it fits? Send us your engine model and serial number or call 0412 532 984 and we will check before you buy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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