90 Amp Fuse Assembly – Fits MerCruiser 3.0L-8.2L (Replaces 79023A91, 88-79023A91, 8M0207795)
90 Amp Fuse Assembly – Fits MerCruiser 3.0L-8.2L (Replaces 79023A91, 88-79023A91, 8M0207795) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
90 Amp Fuse Assembly – Fits MerCruiser 3.0L-8.2L (Replaces 79023A91...
90 Amp Fuse Assembly – Fits MerCruiser 3.0L-8.2L (Replaces 79023A91, 88-79023A91, 8M0207795) is backordered and will ship as soon as it is back in stock.
Product Details
This 90 Amp Fuse Assembly is a crucial safety component designed to protect the starter and alternator circuits on a wide range of Mercury MerCruiser stern drive and inboard engines from 1983 to 2016, covering 3.0L to 8.2L models. It also serves as a power steering motor fuse on specific Mercury Verado outboards.
It is a direct interchange for Mercury/MerCruiser part numbers 79023A91, 88-79023A91, and the superseded 8M0207795, as well as aftermarket equivalents like Sierra 18-8220 and Mallory 9-15510.
- Installs directly using factory mounting points for a perfect fit.
- Features threaded stud terminals for secure, low-resistance electrical connections.
- Constructed with a durable brass and plastic-insulated housing to withstand harsh marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury / MerCruiser | 79023A91 | 8M0207795 |
| Mercury / MerCruiser | 88-79023A91 | 8M0207795 |
| Sierra | 18-8220 | |
| Mallory | 9-15510 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This fuse assembly fits a wide variety of MerCruiser stern drive, inboard, and Verado outboard power steering applications.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 3.0L GM 181 I/L4 | 130–140 | 4-Stroke | 1987–2016 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 4.3L GM 262 V6 | 180–220 | 4-Stroke | 1998–2016 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 5.0L GM 305 V8 | 220–260 | 4-Stroke | 1983–2016 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 5.7L GM 350 V8 | 250–330 | 4-Stroke | 1983–2016 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 6.2L MX 377 V8 | 320–370 | 4-Stroke | 1998–2016 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 7.4L GM 454 V8 | 310–420 | 4-Stroke | 1982–2000 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 8.1L GM 496 V8 | 370–425 | 4-Stroke | 2000–2016 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 8.2L GM 502 V8 | 415–500 | 4-Stroke | 1993–2000 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | Black Scorpion | 330–425 | 4-Stroke | 1996–2002 | 79023A91 | Stern Drive; Now 8M0207795 |
| MerCruiser | 5.7L GM 350 V8 | 250–330 | 4-Stroke | 1997–2016 | 79023A91 | Inboard; Now 8M0207795 |
| MerCruiser | 6.2L MX 377 V8 | 320–370 | 4-Stroke | 1998–2016 | 79023A91 | Inboard; Now 8M0207795 |
| MerCruiser | 7.4L GM 454 V8 | 310–420 | 4-Stroke | 1988–2000 | 79023A91 | Inboard; Now 8M0207795 |
| MerCruiser | 8.1L GM 496 V8 | 370–425 | 4-Stroke | 2000–2016 | 79023A91 | Inboard; Now 8M0207795 |
| MerCruiser | 8.2L GM 502 V8 | 415–500 | 4-Stroke | 1996–2000 | 79023A91 | Inboard; Now 8M0207795 |
| Mercury | Verado | Multiple | 4-Stroke | 2000–2016 | 79023A91 | Power steering motor fuse, Now 8M0207795 |
Technical Specs
- Product Type
- Starter and Alternator Fuse Assembly
- Installation
- Direct replacement with factory mounting
- Amperage Rating
- 90 Amp
- Connection
- Threaded stud terminals
- Housing Material
- Brass with plastic insulation
- Mounting Hole Diameter
- 10 mm (13/32 inch)
What’s in the Box
- 1 x 90 Amp Starter Fuse Assembly
Installation Notes
- Disconnect the battery terminals to prevent electrical shorts. Start with the negative (-) terminal, followed by the positive (+).
- Locate the existing fuse assembly. It is typically found on or near the engine starter motor.
- Carefully remove the nuts securing the main power cables to the fuse assembly's threaded studs.
- Unbolt the fuse assembly from its mounting point.
- Mount the new fuse assembly in the same location, ensuring it is secure.
- Clean the cable terminals before reattaching them to the new fuse studs. Re-secure with the nuts, ensuring a tight connection.
- Reconnect the battery, starting with the positive (+) terminal, then the negative (-). Check for proper function.
Troubleshooting & FAQ
How do I know if my 90 Amp fuse is blown?
A common symptom of a blown fuse is a complete loss of electrical power to the engine's starting system. The engine will not crank or turn over, and you may hear a single click from the starter solenoid. Visually inspect the fuse for a break in the internal metal link.
Where is this fuse typically located on a MerCruiser engine?
This 90 Amp fuse assembly is almost always mounted directly on the starter motor or on a bracket very close to it. It serves as the main protection for the cranking circuit.
My boat has two of these fuses. Why?
On certain engine setups, one fuse is used for the main engine starter circuit, while a second, identical fuse is used to protect the power steering pump motor circuit, especially on models with electric-hydraulic power steering like some Verado applications.
Is there a difference in performance between this aftermarket fuse and the OEM version?
Functionally, there is no difference. Our aftermarket fuse is designed to meet or exceed original equipment manufacturer (OEM) specifications for amperage rating, materials, and durability. It provides the same level of circuit protection as the original MerCruiser part.
What happens if I use a fuse with a different amperage rating?
Using a fuse with a lower rating will likely result in it blowing unnecessarily under normal cranking loads. Using a fuse with a higher rating is extremely dangerous, as it can fail to protect the circuit, leading to a potential fire or catastrophic damage to the starter or wiring.
What is the purpose of the new 8M0207795 part number?
Mercury/MerCruiser often updates or supersedes part numbers over time due to minor manufacturing changes, supplier updates, or consolidation. The part number 8M0207795 is the current official replacement for the older 79023A91 and 88-79023A91, and it is functionally identical.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
