24V 40A/50A Alternator / Generator Assembly 1-81200420-2 1812004202 1-81200442-0 For ISUZU 10PC1 10PD1 CXZ GIGA — OEM Nikko Spec With Twin-Leg Mount & 82mm Pulley
The Generator Assembly (Alternator) with OEM numbers 1-81200420-2 (also listed as 1812004202) and 1-81200442-0 (also listed as 1812004420) is a verified OEM-grade direct replacement for ISUZU heavy-duty trucks equipped with 10PC1, 10PD1, and 12PD1 engines, including the CXZ and GIGA series.
Precision-engineered 24V 40A or 50A output delivers consistent charging performance — verified against ISUZU OEM specifications.
Features a brushless design with internal regulator for enhanced reliability in harsh environments — rated for 400,000+ km under normal operation.
Twin-leg mount with 68mm inside mounting legs, 14mm pivot hole, 12mm adjusting hole, and 225mm mount centre-to-centre. Features an 82mm outside diameter pulley with BB pulley section.
99% direct bolt-on fitment — confirmed across thousands of repair orders for ISUZU 10PC1/CXZ vehicles.
Failure Symptoms: If your generator assembly is failing, you may experience battery warning light illumination, dim or flickering lights, dead or weak battery, electrical system malfunctions, or unusual noises from the generator area.
⚠️ A failing generator can leave you stranded with a dead battery and no electrical power — prompt replacement is essential to maintain vehicle reliability and prevent costly downtime.
| Part Number | 1-81200420-2, 1812004202, 1-81200442-0 |
|---|---|
| Product Name | Alternator |
| Car Model | ISUZU CXZ GIGA |
| Engine Model | ISUZU 10PC1 10PD1 |
| Condition | 100% Brand New |
Primary Applications:
| Brand | Model | Chassis / Series | Engine |
|---|---|---|---|
| ISUZU | CXZ | Heavy-Duty Truck | 10PC1 |
| ISUZU | GIGA | Heavy-Duty Truck | 10PC1, 10PD1 |
| ISUZU | CYZ, CYH, EXZ | Heavy-Duty Truck | 10PC1, 10PD1 |
| Hitachi | Excavators | EX120-2/3, EX400-3/LC-3 | Compatible |
⚠️ Important:
- This generator assembly is designed for ISUZU 10PC1, 10PD1, and 12PD1 diesel engines
- The 24V specification is critical for proper electrical system function — verify your vehicle's voltage requirements before ordering
- Please verify your vehicle's chassis code, model year, and engine code before ordering
Guarantees factory-fit quality and performance — verified by OEM part numbers 1-81200420-2, 1812004202, 1-81200442-0, and 1812004420.
Delivers consistent charging power for heavy-duty 24V electrical systems — verified by OEM specifications.
Enhances reliability and reduces maintenance in harsh environments — verified by Nikko engineering standards.
Ensures correct fitment with 68mm inside legs, 14mm pivot hole, and 225mm centre-to-centre — verified by dimensional specifications.
Ensures correct belt alignment and efficient power transfer — verified by dimensional specifications.
No modifications required — verified by 99% installation success rate.
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 68mm inside legs, 14mm pivot hole, 12mm adjusting hole, 225mm centre-to-centre, and 82mm pulley diameter match OE blueprint specifications |
| Output Test | 100% bench testing to verify 24V 40A or 50A output meets OEM specifications |
| Regulator Function Test | Full testing of the internal voltage regulator to ensure stable charging voltage |
| Bearing / Rotor Test | Noise and vibration testing to verify smooth, noiseless operation |
| Thermal Cycle Test | 500+ hour thermal cycling to verify durability under extreme temperatures |
| Final Assembly Inspection | 100% visual and functional inspection before packaging |
⚠️ IMPORTANT: Professional Installation Recommended
Replacing a generator assembly requires proper belt tension, correct electrical connections, and battery disconnection.
Pre-Installation Checklist:
- Disconnect the negative battery terminal before starting work
- Allow the engine to cool completely
- Verify voltage (24V) and output (40A or 50A) match your vehicle's specifications
- Inspect the drive belt for wear or damage — replace if necessary
- Check the belt tensioner and idler pulleys for smooth operation
- Confirm physical dimensions (68mm inside legs, 14mm pivot hole, 225mm centre-to-centre) match your existing unit
Installation Guidelines (Reference ISUZU workshop manual):
- Disconnect the negative battery terminal
- Remove the drive belt from the generator pulley
- Disconnect the electrical connectors from the generator (B+ terminal and regulator connector)
- Remove the mounting bolts securing the generator
- Carefully remove the old generator
- Clean the mounting surface and bracket thoroughly
- CRITICAL: Install the new generator and hand-tighten the mounting bolts
- Torque the mounting bolts to manufacturer's specified torque settings (refer to ISUZU workshop manual)
- Reconnect all electrical connectors securely
- Reinstall the drive belt — ensure proper routing on the pulley
- Reconnect the negative battery terminal
- Start the engine and verify the battery warning light extinguishes
- Check charging voltage using a multimeter (should read approximately 27-28V for 24V systems)
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months. Check for battery warning light, unusual noises, or dimming lights
- Replacement: Immediately if failure symptoms appear
- Note: When replacing a generator, it is recommended to inspect and replace the drive belt if worn
- Packaging: Each generator assembly is securely packed in a heavy-duty carton with foam inserts to prevent shipping damage
- Quality: Nikko New / OEM Original
- Condition: Brand New — No core charge
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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