Alternator – Fits Mercury Marine 135–400 HP Verado, Pro, Racing & EFI Outboards (Replaces 892940T02)

$297.00 $475.00

Shipping calculated at checkout.

Alternator – Fits Mercury Marine 135–400 HP Verado, Pro, Racing & EFI Outboards (Replaces 892940T02) is backordered and will ship as soon as it is back in stock.

Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This aftermarket Alternator – Fits Mercury Marine 135–400 HP Verado, Pro, Racing & EFI Outboards is designed for 4-stroke, 4 & 6-cylinder Verado, Pro, Racing, and EFI outboards from 2005 onwards. It delivers reliable 70 Amp, 12 Volt power to keep your vessel's electrical systems running smoothly.

It serves as a direct replacement for Mercury Marine 892940T, 892940T01, 892940T02; Sierra 18-5929; and other equivalents, ensuring broad compatibility and straightforward installation.

Engineered for direct bolt-on installation.
Features an S6 serpentine pulley and internal regulator.
Fully compatible with Mercury's SmartCraft digital technology.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Mercury Marine	892940T
Mercury Marine	892940T01
Mercury Marine	892940T02
Sierra	18-5929
Aftermarket	PH300-0048
DB Electrical	400-12307

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This alternator is designed exclusively for the Mercury Marine engine models listed below. Please verify your engine's horsepower, model, and year before ordering.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury Marine	Verado	135	4-Stroke	2006–2009	892940T02	L, XL, CXL variants
Mercury Marine	Verado	150	4-Stroke	2006–2014	892940T02	L, XL, CXL variants
Mercury Marine	Verado	175	4-Stroke	2006–2014	892940T02	L, XL, CXL variants
Mercury Marine	Verado I-4	200	4-Stroke	2008–2011	892940T02	L, XL, CXL variants
Mercury Marine	Verado I-6	200	4-Stroke	2005–2014	892940T02	L, XL, CXL variants
Mercury Marine	Verado	225	4-Stroke	2005–2014	892940T02	L, XL, CXL, XXL, CXXL variants
Mercury Marine	Verado	250	4-Stroke	2005–2014	892940T02	L, XL, CXL, XXL, CXXL variants
Mercury Marine	Verado Pro	250	4-Stroke	2012–2014	892940T02	L, XL variants
Mercury Marine	Verado	275	4-Stroke	2005–2010	892940T02	L, XL, CXL, XXL, CXXL variants
Mercury Marine	Verado	300	4-Stroke	2008–2014	892940T02	L, XL, CXL, XXL, CXXL variants
Mercury Marine	Verado HD	300	4-Stroke	2012–2014	892940T02	L, XL, CXL, XXL, CXXL variants
Mercury Marine	Verado Pro	300	4-Stroke	2012–2014	892940T02	L, XL variants
Mercury Marine	Verado Racing	350	4-Stroke	2009–2014	892940T02	L, XL, CXL, XXL, CXXL DTS variants

Technical Specs

Product Type: Alternator
Installation: Direct bolt-on replacement
Output: 70 Amp, 12 Volt
Housing Color: Black/Silver
Dimensions: Height: 18.0cm, Width: 19.0cm, Length: 21.0cm
Mounting Position: Starboard side of engine
Clock Position: 6 o'clock
Pulley Type: S6 (Serpentine, 6-rib)
Regulator Type: Internal Regulator (IR)
Fan Type: Internal Fan (IF)
Other Technical Attributes: Compatible with SmartCraft digital technology

What’s in the Box

1 x Alternator (892940T02)

Installation Notes

Disconnect the vessel's battery cables (negative first, then positive) to prevent electrical shorts.
Loosen the serpentine belt tensioner and remove the belt from the alternator pulley.
Disconnect the electrical connectors and remove the mounting bolts securing the old alternator.
Position the new alternator, fasten the mounting bolts to the manufacturer's specified torque, and reconnect the electrical harnesses.
Reinstall the serpentine belt, ensuring it is properly tensioned. Reconnect the battery (positive first, then negative) and start the engine to verify correct charging operation.

Troubleshooting & FAQ

How do I confirm this alternator fits my Verado engine?

The best way is to check the part number on your existing alternator. If it matches any of the numbers in our Part Number Matrix (e.g., 892940T02), it will fit. You can also use our Engine & Model Compatibility table to verify by your engine's model and year.

What are the signs of a failing alternator on my outboard?

Common symptoms include a battery that won't stay charged, dimming lights a low voltage alarm or fault code on your SmartCraft gauges, and sometimes a grinding or whining noise coming from the alternator itself.

Is this a direct bolt-on replacement?

Yes, this unit is designed to be a direct, bolt-on replacement for the original OEM alternator. It uses the same mounting points and electrical connections, requiring no modifications for installation.

What is the difference between this aftermarket alternator and the OEM Mercury part?

Functionally, there is no difference. Our aftermarket alternator is built to meet or exceed OEM specifications for fit, form, and function, including output (70A/12V) and SmartCraft compatibility. The primary difference is the price point and the brand name.

My SmartCraft system is showing a charging fault. Could the alternator be the issue?

Yes, a charging system fault on your SmartCraft display often points directly to a failing or failed alternator. You should have the battery and charging system professionally tested to confirm the alternator is the root cause before replacing it.

What maintenance does this alternator require?

Marine alternators are generally maintenance-free. The most important factor is keeping the serpentine belt in good condition and properly tensioned. Regularly inspect the belt for cracks, fraying, or glazing.

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.

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