Alternator for Caterpillar 3306 & 3406 Engines 1982-1995
Alternator for Caterpillar 3306 & 3406 Engines 1982-1995
SKU:400-24091
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Alternator for Caterpillar 3306 & 3406 Engines
24-Volt · Ignition-Activated · 1982-1995
This 24-volt alternator is a direct-fit aftermarket replacement for Caterpillar 3306 and 3406 diesel engines, as fitted to a wide range of Caterpillar construction and industrial equipment including compactors, excavators, graders, wheel loaders and scrapers.
It is internally regulated (regulator #1-197-011-000 equivalent) and ignition-activated rather than self-exciting, so it must be wired to an ignition-switched feed. The unit features high-temperature epoxy, heavy-duty rectifiers and high-quality regulators for reliable service in heavy-duty applications.
Key Features
- Direct OEM-fit replacement for Caterpillar 3306/3406 engines
- Internally regulated, ignition-activated (not self-exciting)
- External fan cooling for extended duty cycles
- Heavy-duty rectifiers and bearings
- 1-year warranty
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 24V |
| Amperage | 50A |
| Rotation | CW (Clockwise) |
| Regulator | Internal (IR) |
| Fan Type | External (EF) |
| Clock Position | 12 |
| Activation | Ignition-activated (not self-exciting) |
| Weight | 26 lbs |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model | Years |
|---|---|
| Caterpillar 3306/3406 powered equipment (excavators, graders, track loaders, wheel loaders, scrapers, pipelayers) | 1982-1995 |
| Caterpillar 816 / 816B Landfill Compactor | 1982-1999 |
| John Deere crawlers, graders and loaders using the equivalent unit | 1978-1997 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 400-24091 | Arrowhead |
| 0R3668 | Caterpillar |
| 100-5046 | Caterpillar |
| 3V8825 | Caterpillar |
| AT85458 | John Deere |
| TY6681 | John Deere |
| Bosch equivalent | Bosch |
| Lester equivalent | Lester |
| Volvo equivalent | Volvo |
Frequently Asked Questions
Will this fit without modification?
Yes, this is a direct replacement for the original Caterpillar 3306/3406 alternator - no bracket or pulley changes are required.
What is included?
One complete 24V alternator unit, tested before dispatch.
Why is my new alternator not charging?
This unit is ignition-activated, not self-exciting - it must receive a switched ignition feed to begin charging, unlike some self-exciting replacements.
How do I know my old alternator has failed?
Common signs are a charge warning light staying on, a battery that won't hold charge, dimming lights, or unusual noise from the unit.
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