This permanent magnet alternator (PMA) is a direct replacement for Isuzu 4LE1PV01 and 4LE1PV industrial engine applications, manufactured by Kokusan Denki and built to OEM specifications. It is designed to bolt straight in without any changes to the existing mounting or drive arrangement.
It is rated at 12 volts with a 20 amp output and uses an internal regulator (IR) configuration, so no separate external regulator box is needed. It replaces Isuzu 8972268403, 8972268404 and 8981565270 and the Kokusan Denki GP9906 and GP9926 units. The alternator has an oval 3-pin main plug plus a separate single-terminal secondary plug, matching the original connector layout so your existing wiring loom simply reconnects.
Key Features
- 12-Volt, 20 Amp permanent magnet alternator (PMA)
- Internal Regulator (IR)
- Kokusan Denki manufactured unit
- Oval 3-pin main plug + single-terminal secondary plug
- Direct fit for Isuzu 4LE1PV01 / 4LE1PV industrial engines
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
20A |
| Type |
Permanent Magnet Alternator |
| Regulator Type |
IR |
| Manufacturer |
Kokusan Denki |
| Main Plug |
Oval, 3-Pin (I-R-L) |
| Secondary Plug |
1-Terminal |
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 |
| Isuzu 4LE1PV01 Industrial Engine |
All Years |
| Isuzu 4LE1PV Industrial Engine |
All Years |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 8972268403 |
Isuzu |
| 8972268404 |
Isuzu |
| 8981565270 |
Isuzu |
| GP9906 |
Kokusan Denki |
| GP9926 |
Kokusan Denki |
| 113743 |
Cargo |
| APM0004 |
Arrowhead |
| 10931 |
Lester |
Frequently Asked Questions
Will this alternator fit my Isuzu 4LE1 engine without modification?
Yes, this is a direct OEM-fit replacement built to the original Kokusan Denki specification, so no modification is required for installation.
What's included?
You will receive one complete alternator unit, ready to fit. Your existing wiring loom connects directly to the oval main plug and secondary terminal.
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 do the two electrical plugs on this alternator connect to?
The oval 3-pin plug (marked I-R-L) is the main connector, while the smaller single-terminal plug is a secondary B+ style connection - both should be reconnected to match your original wiring for correct charging operation.
How do I confirm this is the right alternator?
Check the number on your original unit against the cross reference table above - this alternator replaces Isuzu 8972268403 and 8981565270, Kokusan Denki GP9906 and GP9926, Cargo 113743 and Lester 10931.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
