ISUZU Starter Solenoid Switch 24V 4.5kW OEM Standard for FVR34 6HK1 Diesel Engine
| Rated Power: | 4.5kW | Rated Voltage: | 24V |
| Compatible Starter: | 1811003241 | OEM Part Number: | 1-81100133-0 / 1811001330 |
| Cross-Reference Number: | 1811296570 | Installation Position: | On Starter Housing |
| Material: | High-strength Aluminum Alloy & Precision Bearings | Cooling Type: | Engine Coolant Circulation |
| High Light: | 24V Starter Solenoid Switch,4.5kW Starter Magnet Switch,OEM Standard Solenoid Switch |
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The ISUZU Starter Solenoid Switch with OEM numbers 1-81100133-0 / 1811001330 is a precision-engineered replacement designed for ISUZU FVR34 series heavy-duty trucks, compatible with 6HK1 diesel engines. This component is a core control unit of the starter assembly responsible for closing the starter main circuit when the key is turned, engaging the starter drive gear with the flywheel ring gear for engine startup.
The starter solenoid switch (also known as "magnetic switch") is a critical control component of the starter assembly, mounted on the starter housing and integrated with the starter motor.
- Electromagnetic Actuation: When the key is turned to the "START" position, a small current flows through the pull-in and hold-in coils, generating electromagnetic force.
- Contact Closure: The electromagnetic force pulls the plunger forward, engaging the starter drive gear with the flywheel ring gear via a fork mechanism; simultaneously, the main contacts close, completing the starter main circuit.
- Motor Operation: High current flows through the closed main contacts to the starter motor, generating powerful torque to rotate the flywheel for engine startup.
- Automatic Disengagement: After engine start, the key is released, control circuit power is cut, the plunger returns under spring force, the main contacts open, and the drive gear disengages.
| Symptom | Probable Cause |
|---|---|
| No response from starter when key is turned; no click sound | Burnt solenoid coils or open circuit |
| Clicking sound heard but starter doesn't crank | Burnt or pitted main contacts; unable to pass high current |
| Starter continues running after key is released | Sticking solenoid contacts |
| Starter cranks slowly; low speed | Excessive contact resistance causing voltage drop |
| Loud metallic grinding noise during startup | Insufficient plunger travel; incomplete gear engagement |
| Brand | Model | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | FVR34 | 6HK1 | Heavy-duty truck |
| ISUZU | FVZ34 | 6HK1 | Heavy-duty truck |
| ISUZU | FVR | 6HK1, 6HE1 | Heavy-duty truck |
| ISUZU | FTR | 6HK1, 6HE1 | Medium-duty truck |
| ISUZU | FSR | 6HK1, 6HE1 | Medium-duty truck |
| ISUZU | CXZ | 6HK1 | Heavy-duty truck |
| ISUZU | Giga series | 6HK1, 6HE1 | Heavy-duty truck |
- Number Confirmation: This product number is 1-81100133-0 / 1811001330. Same-series number 1-81100133-J / 181100133J also exists. Verify the specific number on the original part before ordering.
- Associated Components: When replacing the solenoid switch, it is recommended to inspect the starter motor brushes, one-way clutch, and drive gear — replace or rebuild the starter assembly if necessary.
- Electrical Connection: Confirm vehicle electrical system is 24V before installation and check battery voltage.
- Installation Torque: Refer to ISUZU factory workshop manual for solenoid mounting bolt and main cable terminal torque specifications.
- Professional Installation: The starter solenoid involves high-voltage electrical systems — professional installation is strongly recommended.
| QC Item | Inspection Method | Acceptance Criterion | Frequency |
|---|---|---|---|
| Coil resistance | Multimeter / Resistance tester | Standard resistance range (pull-in/hold-in coils) | 100% |
| Pull-in voltage | Special test equipment | Standard voltage range (24V system) | 100% |
| Main contact resistance | Micro-ohmmeter | ≤ standard value | 100% |
| Insulation withstand voltage | Hi-pot tester | Per insulation standard | 100% |
| Visual inspection | Visual | No scratches, burrs, or rust | 100% |
| 100% function test | Special inspection equipment | 100% tested | 100% |
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