Mercury MerCruiser 377 Scorpion Ignition Wire Kit 847701Q26 (1999–2000)
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Part Details
- Part Number: 847701Q26 (also listed as 84-847701Q26)
- Brand: Mercury Marine / Quicksilver
- Product Type: Spark Plug & Ignition Wire Kit
- Wire Colour: Blue
- Application: MCM 377 Scorpion, 1999–2000
- GTIN / Barcode: 745061495104
- System: Ignition — spark plugs and ignition coil leads
- Diagram Position: Ignition wire set serving distributor, coil, and all spark plug positions
- Supersedes: 847701A26
Compatible Applications
This kit is specific to the MCM 377 Scorpion. Verify by engine model, year, and serial number before ordering:
- Mercury MerCruiser MCM 377 Scorpion — 1999 model year
- Mercury MerCruiser MCM 377 Scorpion — 2000 model year
The 377 Scorpion is a specialized high-performance V8 engine. This wire set is not interchangeable with standard 5.7L or 6.2L MerCruiser ignition-wire kits. Confirm the engine serial number and existing wire-set part number before ordering.
Part Number Fitment Guide
Mercury produced several visually similar blue V8 wire kits for different engines. The last two digits of the part number determine the correct application — do not select by wire colour alone:
- 847701Q26 — MCM 377 Scorpion, 1999–2000 (this kit)
- 847701Q24 — MIE 350 MAG Horizon (search by part number)
- 847701Q17 — MIE 454 MAG MPI Horizon (search by part number)
- 847701Q25 — MCM 500 EFI / 575 SCi (search by part number)
Alternate & Superseded Part Numbers
- 847701Q26 / 84-847701Q26 — current active number
- 847701A26 — earlier Mercury reference, superseded by 847701Q26
Dimensions & Weight
- Weight: approx. 0.60 kg (1.32 lb)
- Estimated packed dimensions: approx. 18.00 in. × 8.00 in. × 4.00 in. (45.72 cm × 20.32 cm × 10.16 cm)
When to Replace
Replace the ignition wire set if inspection shows any of the following:
- Cracked or hardened insulation
- Burned or damaged spark-plug boots
- Corroded terminals
- Arcing or carbon tracking on the wire surface
- Excessive resistance measured at any wire
- Intermittent misfire or rough running under load
- Ignition leakage in damp or wet conditions
Ignition wires are commonly inspected and replaced during spark-plug and distributor service.
Service Interval
Inspect ignition wires at every spark-plug service. Replace the full set whenever wires show physical damage, elevated resistance, or when spark plugs are replaced as part of a tune-up. Refer to the Mercury MerCruiser service manual for the recommended inspection interval for the 377 Scorpion.
Installation Notes
- Replace one wire at a time to preserve the correct firing order
- Match new wire lengths and routing to the original set
- Route wires clear of exhaust manifolds and sharp edges
- Fully seat each terminal at the distributor/coil and at each spark plug
- Reinstall factory wire separators and retainers to prevent crossfire and abrasion
- Inspect spark plugs, distributor cap, rotor, and coil connections at the same time
Parts Desk Insights
The most common ordering mistake with this kit is selecting by wire colour rather than by part number. Mercury used several different blue 847701-series wire sets across different V8 engines — the suffix digits (Q26, Q24, Q25, etc.) are what determine the correct application. For the 1999–2000 MCM 377 Scorpion, 847701Q26 is the dedicated kit. If you're unsure, confirm with the engine serial number and the ignition diagram from the Mercury parts guide before ordering.
Technical FAQ
Q: Is this the same as other blue Mercury ignition wire kits?
A: No. Mercury made several visually similar blue wire sets for different V8 engines. 847701Q26 is specifically for the 1999–2000 MCM 377 Scorpion. Always verify by part number, not wire colour.
Q: What did 847701Q26 replace?
A: It supersedes the earlier Mercury reference number 847701A26, which was the previous listing for this same application.
Q: Should I replace wires one at a time or as a full set?
A: Replace as a complete set. All wires in the kit age together, and replacing a full set ensures consistent resistance and reliability across all cylinders.
Q: What other parts should I replace at the same time?
A: During a tune-up, consider replacing spark plugs, distributor cap, rotor, and inspecting the coil. Replacing ignition components together ensures the full ignition system is restored to proper specification.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Packaging must be undamaged and suitable for resale
Important:
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