This aftermarket marine alternator is built on the Delco 7SI platform with a 6-groove, 50mm OD pulley, engineered for MerCruiser Scorpion Alpha and Bravo sterndrive applications with high-temperature epoxy and grease for engine bay heat.
Heavy-duty rectifiers and SAE J1171 marine ignition-protection compliance make it a direct-fit OEM replacement for the Mercury Marine 863077-1 alternator, with the P-terminal located on the rear cover as per the original.
Key Features
- 70 Amp output, 12 Volt, clockwise rotation
- Delco 7SI type internally regulated (IR) alternator
- Internal fan (IF), 6-groove 50mm OD pulley
- SAE J1171 marine ignition-protection compliant
- High-temperature epoxy & grease for marine engine bays
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
70A |
| Rotation |
Clockwise (CW) |
| Regulator |
Internal (IR) |
| Fan Type |
Internal (IF) |
| Pulley |
6-Groove, 50mm OD |
| Alternator Family |
Delco 7SI |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part across MerCruiser 4.3L-7.4L engines. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| MerCruiser 4.3L EFI (262 cu in, 6 cyl) |
1998-2000 |
| MerCruiser 5.7L (350 cu in, 8 cyl) |
1998-2002 |
| MerCruiser 350 Mag MPI (5.7L, 8 cyl) |
1998-2001 |
| MerCruiser 454 Mag MPI (7.4L, 8 cyl) |
2000-2001 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 863077-1, 863077T, 8M0095472 |
Mercury Marine |
| 19020611, 19020612, 8600612 |
Delco |
| ADR0316 |
Arrowhead |
| 18-6298 |
Sierra Marine |
| 1-2837-01DR |
WAI |
| 90-01-4425 |
Wilson |
Frequently Asked Questions
Will this alternator fit my Scorpion Alpha or Bravo without modification?
Yes, it is a direct, bolt-on replacement using the same pulley, mounting and terminal layout as the original Mercury Marine 863077-1 alternator.
What is included?
One complete 70A, 12V marine alternator, ready to fit.
How can I tell my existing alternator has failed?
Look out for a dashboard charge warning light, a battery that will not hold charge, or dimming/flickering electrical accessories while running.
Where is the P-terminal located?
On the rear cover of the alternator, matching the original equipment layout.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
