Mercury MerCruiser Quicksilver 110 Amp Fuse Assembly 79023T10
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110 Amp High-Current Fuse Assembly — OEM Reference 79023T10 / 88-79023T10
Part Number: 79023T10 | Service format: 88-79023T10
Brand: Mercury Marine / Quicksilver
Official Product Type: High-Current Fuse Assembly — 110 Amp
Supersedes: 79023A10 / 88-79023A10
Replaced By: 79023T10 is the current active OEM part number
System: Electrical — High-Current Circuit Protection
Diagram Position: Installed in the high-current electrical circuit where Mercury specifies a 110-amp protection device (battery-switch, key-switch, power-trim, or power-steering circuit depending on application)
GTIN: 745061076150
What This Fuse Assembly Does
This genuine Mercury Marine / Quicksilver OEM fuse assembly provides 110-amp high-current protection for selected electrical circuits on Mercury outboard, Mariner, and MerCruiser applications. It is designed to protect wiring and electrical components from overload damage and is matched to Mercury’s electrical harness specifications. This is the 110-amp version — Mercury uses the same basic fuse style in several amperage ratings, and the correct amperage must match the circuit’s wiring diagram. Do not substitute a different amperage, even if the housing looks identical.
Compatible Applications
Fitment is by electrical circuit and harness diagram, not engine model alone. Confirm the correct fuse rating and location using your Mercury wiring diagram and engine serial number before ordering.
- Selected Mercury outboard electrical systems (battery-switch, key-switch, power-trim, power-steering circuits)
- Selected Mariner outboard electrical systems
- Selected Mercury Verado electrical systems
- Selected Mercury OptiMax / DFI electrical assemblies (including 200XS DFI 2.5L ROS applications)
- Selected Mercury EFI electrical systems
- Selected MerCruiser sterndrive engine electrical harness applications
- High-current trim-pump and wiring assemblies where 79023T10 is diagram-specified
Do not substitute with other Mercury fuse assemblies of different ratings:
- 79023T56 — 55 amp (different rating, not interchangeable)
- 79023T90 — 90 amp (different rating, not interchangeable)
Serial Number / Circuit Fitment Notice
Fuse assemblies vary by harness, amperage, mounting style, and circuit function. Verify the correct part number using your exact engine serial number and the Mercury electrical / harness / fuse assembly parts diagram for your specific circuit location.
When to Replace This Fuse Assembly
Replace when any of the following are present:
- Fuse has opened due to an electrical overload
- Fuse element fails a continuity test
- Terminals show severe corrosion or heat discoloration
- Fuse plate is cracked or physically distorted
- Electrical diagnosis confirms an open high-current fuse in the protected circuit
Important: A failed 110-amp fuse should prompt diagnosis of the protected circuit before replacement. Repeated fuse failure points to a wiring short, overload, loose connection, or failed component that must be corrected first.
Service Interval
Inspect at every electrical service or when electrical symptoms are present. Replace on condition — fuse assemblies are not routine wear items but should be replaced immediately if failure is confirmed.
Dimensions
Weight: approx. 0.07 kg (0.15 lb) | Rating: 110 amps | Quantity per assembly: 1
Installation Notes
- Disconnect battery power before servicing any high-current electrical components.
- Confirm the correct fuse location in the Mercury wiring diagram before removal.
- Inspect cable terminals, mounting hardware, insulation, and nearby wiring for corrosion, heat damage, or loose connections.
- In documented Mercury high-current assemblies, 79023T10 is installed alongside components including positive wire assembly 79139A12, washers, lockwashers, nuts, and insulator 861680 — inspect all hardware at service time.
- Diagnose and correct any underlying electrical fault before installing the replacement fuse.
- Use the correct OEM amperage only — never bypass or substitute a higher-rated fuse.
Kit Contents
Single fuse assembly. Hardware (washers, nuts, insulators) is sold separately — inspect existing hardware and replace as needed from your Mercury wiring diagram.
Alternate and Superseded Part Numbers
- Current: 79023T10 / 88-79023T10
- Supersedes: 79023A10 / 88-79023A10
No known aftermarket cross-reference. Order by OEM part number for correct fuse housing, terminal, and amperage match.
Related Parts
- Positive wire assembly 79139A12 — commonly installed with this fuse in high-current assemblies
- Mercury 55-amp fuse assembly 79023T56 — lower-rated version for different circuits (confirm by diagram)
- Mercury 90-amp fuse assembly 79023T90 — alternate rating for different circuits (confirm by diagram)
- Terminal hardware (washers, lockwashers, nuts, insulators) — verify by wiring diagram
Parts Desk Insights
The most important step when replacing a 110-amp fuse assembly is understanding why the original fuse opened. A blown high-current fuse is a symptom, not the root problem — replacing the fuse without finding the cause typically results in a second failure, sometimes with additional wiring or component damage. Check the protected circuit (trim pump, power steering, charging, or starting system) for shorts, loose connections, or failed components before putting the boat back in service. Mercury uses the same fuse housing style in multiple amperage ratings, so always order by part number (79023T10), not by appearance alone.
Technical FAQ
Q: Can I use the 90-amp or 55-amp fuse assembly if the 110-amp is unavailable?
No. The fuse rating must match the circuit’s wiring diagram. A lower-rated fuse will open under normal operating load; a higher-rated fuse will not protect the circuit properly. Order the correct 110-amp rating only.
Q: Is 79023A10 the same as 79023T10?
Yes — 79023T10 supersedes 79023A10. They serve the same function; 79023T10 is the current OEM version to order.
Q: My 110-amp fuse keeps blowing. What should I check?
A repeated fuse failure indicates a fault in the protected circuit — common causes include a failing trim pump motor, short in the power-steering system, corroded or loose high-current connections, or a failing charging component. Diagnose the circuit before replacing the fuse again.
Q: Do I need to disconnect the battery before replacing this fuse?
Yes. Always disconnect battery power before working on any high-current fuse assembly to prevent accidental shorts or electrical injury.
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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