This is an aftermarket marine alternator engineered for MerCruiser inboard and sterndrive engines, built on the Delco 7SI platform with a 6-groove, 65mm OD pulley. High-temperature epoxy and grease protect the windings from engine bay heat.
Heavy-duty rectifiers and a quality internal regulator give performance equivalent to the original equipment unit, as a direct-fit replacement for Mercury Marine 862031, 862031T and 862031T1 alternators.
Key Features
- 65 Amp output, 12 Volt, clockwise rotation
- Delco 7SI type internally regulated (IR) alternator
- Internal fan (IF), 6-groove 65mm OD pulley
- High-temperature epoxy & grease for marine engine bays
- Heavy-duty rectifiers and OEM-equivalent output
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
65A |
| Rotation |
Clockwise (CW) |
| Regulator |
Internal (IR) |
| Fan Type |
Internal (IF) |
| Pulley |
6-Groove, 65mm OD |
| Alternator Family |
Delco 7SI |
Vehicle Fitment Guide
| Make & Model |
Years |
| MerCruiser 350 Mag MPI (5.7L) |
1998-2001 |
| MerCruiser 4.3L EFI |
1998-2002 |
| MerCruiser 5.7L (2-BBL & EFI) |
1998-2002 |
| MerCruiser 7.4L MIE MPI |
1998-2000 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 862031, 862031T, 862031T1 |
Mercury Marine |
| 19020601, 19020609 |
Delco |
| ADR0299 |
Arrowhead |
| 18-6293 |
Sierra Marine |
| 1-2485-01DR |
WAI |
Frequently Asked Questions
Will this alternator fit my MerCruiser without modification?
Yes, it is a direct, bolt-on replacement using the same pulley size, mounting and terminal layout as the original Mercury Marine 862031 alternator.
What is included?
One complete 65A, 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.
Is this alternator suitable for saltwater use?
It is built for marine engine bay conditions with high-temperature epoxy and grease, but always follow your engine manufacturer's corrosion-protection guidance for saltwater use.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
