Alternator for Marine Applications - Delco 10SI 12V 63A
Alternator for Marine Applications - Delco 10SI 12V 63A
SKU:400-20004
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Alternator for Marine Applications - Delco 10SI 12V 63A
Marine applications - Delco 10SI type conversion, 12V 63A
This alternator is built for marine engine applications as a Delco 10SI type conversion unit, supplied to replace the original Motorola-pattern alternator fitted to many marine engines. It runs a 12-volt system with a single V-pulley (17mm ID) and a single-wire hook-up, keeping installation straightforward.
It is manufactured to OEM specifications for output and mounting, with an internal regulator (IR) and external fan (EF) cooling. Output on this version sits in the 61-78 amp range depending on manufacturer, with a 1-inch bottom mounting foot matching the original bracket.
Key Features
- 12-volt marine alternator
- 61-78 amp output (Delco 10SI type)
- 1-V pulley with 17mm ID
- 1-wire hook-up for simple installation
- Internal regulator (IR), external fan (EF)
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 63A (61-78A range) |
| Pulley Type | 1-V, 17mm ID |
| Fan Type | External Fan (EF) |
| Regulator | Internal Regulator (IR) |
Vehicle Fitment Guide
Universal fitment - this part is not model specific. Check the specifications above against the unit you are replacing.
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 4-1064XMP | Arrowhead |
| ADR0396 | Arrowhead (legacy code) |
| 8904 | EMP |
| 400-20004R | Lester |
| 240-036 | JANNCO |
Frequently Asked Questions
Will this fit my marine engine without modification?
This is a Delco 10SI type conversion unit designed to replace Motorola-pattern alternators - check your original unit's pulley and mounting foot match before ordering, as replaced Motorola units with a 15mm ID pulley will not transfer across.
What is included?
One new 12-volt Delco 10SI type marine alternator, ready to fit.
How do I know my old alternator has failed?
Signs include a charge warning light, a battery that discharges even with the engine running, dimming instruments or lights, or a grinding/whining noise from the unit.
What wiring configuration does this unit use?
A 1-wire hook-up, which is simpler to install than 2-wire versions - a 2-wire hook-up version of this unit is also available separately.
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