1. Product Overview
This manual provides essential information for the installation, operation, and maintenance of your DB Electrical 400-48156 remanufactured alternator. This unit is designed to replace the original alternator in compatible Nissan and Infiniti vehicles, ensuring proper electrical system function and battery charging.
Key specifications for this alternator include:
- Unit Type: Alternator
- Voltage: 12V
- Rotation: Clockwise (CW)
- Amperage: 110A
- Pulley Class: S6
- Regulator Type: Internal Regulator (IR)
- Fan Type: Internal Fan (IF)
2. Vehicle Compatibility
This DB Electrical 400-48156 alternator is compatible with the following vehicle models and years:
- INFINITI: FX35 (2003-2008), G35 (2003-2006)
- NISSAN: 350Z (2003-2006), PATHFINDER (2004)
Please verify part fitment for your specific vehicle before installation. Refer to your vehicle's service manual for detailed compatibility information.
3. Product Views
Front view of the DB Electrical 400-48156 alternator, showing the pulley and mounting points.
Rear view of the alternator, highlighting the electrical connection points and cooling fins.
Top-down perspective of the alternator, showing the overall casing and internal components.
Angled view of the alternator, detailing the various mounting brackets and bolt holes.
Side profile of the alternator, illustrating its compact design and cooling vents.
Close-up view of the alternator's pulley and shaft assembly.
4. Installation Instructions
Safety First: Always disconnect the negative battery terminal before beginning any work on your vehicle's electrical system. Wear appropriate safety gear, including gloves and eye protection. Consult your vehicle's specific service manual for detailed steps and torque specifications.
- Prepare Vehicle: Park the vehicle on a level surface, engage the parking brake, and turn off the engine. Allow the engine to cool completely.
- Disconnect Battery: Locate your vehicle's battery and disconnect the negative (-) terminal first, followed by the positive (+) terminal. Isolate the cables to prevent accidental contact.
- Access Alternator: Depending on your vehicle model, you may need to remove other components (e.g., air intake, belts, covers) to gain access to the alternator.
- Remove Drive Belt: Loosen the tensioner pulley to relieve tension on the serpentine belt, then remove the belt from the alternator pulley.
- Disconnect Wiring: Carefully disconnect all electrical connections from the old alternator. This typically includes the main power wire (often a large gauge wire with a nut) and a multi-pin connector for the regulator.
- Remove Mounting Bolts: Unbolt the old alternator from its mounting brackets. Note the position and type of each bolt.
- Remove Old Alternator: Carefully extract the old alternator from the engine bay.
- Install New Alternator: Position the new DB Electrical 400-48156 alternator into place and secure it with the mounting bolts. Tighten bolts to manufacturer specifications.
- Reconnect Wiring: Reconnect all electrical connections to the new alternator. Ensure connections are clean and secure.
- Install Drive Belt: Route the serpentine belt correctly over all pulleys, including the alternator pulley. Adjust the tensioner to achieve the proper belt tension.
- Reconnect Battery: Reconnect the positive (+) battery terminal first, then the negative (-) terminal.
- Test System: Start the engine and check for proper charging system operation. Observe the dashboard warning lights and use a voltmeter to confirm the battery is charging (typically 13.5-14.5V).
5. Operation
The alternator is a crucial component of your vehicle's electrical system. Its primary function is to generate electrical power to run the vehicle's electrical components (lights, radio, ignition system, etc.) and to recharge the battery while the engine is running. When the engine is off, the battery powers these components. Once the engine starts, the alternator takes over, converting mechanical energy from the engine's crankshaft (via the serpentine belt) into electrical energy.
A properly functioning alternator will maintain a stable voltage output, typically between 13.5 and 14.5 volts, ensuring the battery remains charged and all electrical systems receive adequate power. Fluctuations outside this range may indicate an issue with the alternator or other charging system components.
6. Maintenance
While alternators are generally low-maintenance components, periodic checks can help ensure their longevity and proper function:
- Inspect Drive Belt: Regularly check the serpentine belt for cracks, fraying, or excessive wear. Ensure it has proper tension. A loose or worn belt can lead to insufficient charging.
- Check Wiring Connections: Periodically inspect all electrical connections to the alternator for corrosion, looseness, or damage. Clean any corrosion and ensure connections are tight.
- Battery Health: A weak or failing battery can put extra strain on the alternator. Ensure your battery is in good condition and holds a charge properly.
- Avoid Overloading: Minimize the use of high-draw electrical accessories when the engine is off or at low RPMs to reduce strain on the charging system.
- Keep Clean: Keep the alternator free from excessive dirt, oil, and debris, which can hinder cooling and affect performance.
7. Troubleshooting
If you experience issues with your vehicle's charging system, consider the following common problems and potential solutions:
| Symptom | Possible Cause | Solution |
|---|---|---|
| Battery warning light on dashboard | Failing alternator, loose/damaged belt, faulty wiring, dead battery | Check belt tension and condition. Inspect wiring. Test battery and alternator output. Replace faulty component. |
| Dim headlights or interior lights | Insufficient power from alternator, weak battery | Test alternator output and battery voltage. Ensure all connections are secure. |
| Battery not charging | Alternator failure, broken drive belt, corroded battery terminals, faulty voltage regulator | Inspect belt. Clean battery terminals. Test alternator and regulator. Replace as needed. |
| Grinding or whining noise from engine bay | Worn alternator bearings, loose pulley, worn drive belt | Inspect alternator for physical damage or loose components. Check belt condition and tension. Professional inspection recommended. |
| Burning rubber smell | Slipping or worn drive belt | Inspect drive belt for wear and proper tension. Replace if necessary. |
If troubleshooting steps do not resolve the issue, it is recommended to consult a qualified automotive technician.
8. Technical Specifications
- Manufacturer: DB Electrical
- Model Number: 400-48156 (also AMT0179)
- Item Weight: Approximately 13.57 pounds
- Package Dimensions: Approximately 9.84 x 7.56 x 6.61 inches
- Exterior Finish: Machined
- OEM Part Numbers Replaced: 11052, 11052N, 12569, 1-3030-01MI, 203-5047, 213-9563, 23100-CD010, 400-48156, 90-27-3302, A3051, A3TG0191, A-8981, LRA03601, M900134, 13-9563
9. Warranty and Support
For information regarding the warranty period and terms for your DB Electrical 400-48156 alternator, please refer to the documentation provided at the time of purchase or visit the official DB Electrical website. If you require technical assistance, have questions about installation, or need to process a warranty claim, please contact DB Electrical customer support directly through their official channels.