Alternator for Perkins 403A-11, 403C-11, 403D-11 & 403F-11 - 12V 20A PMA
Alternator for Perkins 403A-11, 403C-11, 403D-11 & 403F-11 - 12V 20A PMA
SKU:400-58008
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Alternator for Perkins 403A-11, 403C-11, 403D-11 & 403F-11 - 12V 20A PMA
Perkins 403 Series Engine Alternator - Permanent Magnet, 12V 20A
This permanent magnet alternator (PMA) is a direct replacement for Perkins 403 series engine applications, built to OEM specifications for fit and function. It is designed to bolt straight into the existing mounting foot without any drilling or bracket changes.
Rated at 12 volts with a 20 amp output, it uses an external regulator (ER) configuration and a 10mm mounting foot with an 8mm x 1.25 adjuster ear, matching the standard mounting layout used across this Perkins engine range. It replaces the Kokusan Denki-built unit carrying part number 185046160.
Key Features
- 12-Volt, 20 Amp output
- Permanent magnet alternator (PMA)
- External Regulator (ER)
- 10mm mounting foot, 8mm x 1.25 adjuster ear
- Direct OEM fit for Perkins 403 series engines
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 20A |
| Type | Permanent Magnet Alternator |
| Regulator Type | ER |
| Mounting Foot | 10mm |
| Adjuster Ear | 8mm x 1.25 |
| Original Manufacturer | Kokusan Denki |
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 |
|---|---|
| Perkins 403A-11 Engine | Not specified |
| Perkins 403C-11 Engine | Not specified |
| Perkins 403D-11 Engine | Not specified |
| Perkins 403F-11 Engine | Not specified |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 185046160 | Kokusan Denki |
| 550185046160 | Kokusan Denki |
Frequently Asked Questions
Will this alternator fit my Perkins engine without modification?
Yes, this is a direct OEM-fit replacement built to the original specification, with a matching 10mm mounting foot and 8mm x 1.25 adjuster ear, so no modification is required for installation.
What's included?
You will receive one complete alternator unit, ready to fit. The external regulator is not included and should be reused from your existing installation if serviceable.
How can I tell my old alternator has failed?
Common signs include a battery warning light, dimming or flickering lights, or a battery that will not hold charge even after a full charge cycle.
What does PMA and ER mean on this alternator?
PMA stands for Permanent Magnet Alternator - the rotor uses fixed magnets rather than field windings - and ER means the voltage regulator is an external, separate component rather than built into the alternator body.
How do I confirm this is the right unit for my engine?
Check the number stamped on your existing alternator against 185046160 or 550185046160, and confirm the 12V 20A rating. If your original carries a different number, contact our technical team before ordering.
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