Original Cummins engine spare parts alternator C4365991

Equipped with a 3-phase permanent magnet rotor and a precision-wound stator, the alternator delivers a rated output of 150A at 12V (1800W power) and a maximum output of 170A—sufficient to power the engine’s critical electrical components (ECU, fuel injection system, cooling fan) and auxiliary devices (GPS, refrigeration units, cabin lights) simultaneously. It achieves a peak efficiency of 88% (at 2000 RPM engine speed), outperforming standard alternators (80–85% efficiency) and reducing parasitic load on the engine—directly improving fuel efficiency by 1–2% in long-haul operations. The alternator’s voltage regulation system (with a tolerance of ±0.2V) maintains stable output even as engine speed fluctuates (from 800 RPM idle to 2500 RPM full load), preventing battery overcharging or undercharging and extending battery service life by 30%

Engineered to withstand the harsh conditions of heavy-duty engine operation—extreme temperatures, vibration, and oil/coolant exposure—the alternator features a durable, multi-layer design:

Housing: Die-cast aluminum alloy housing (ADC12 grade) with a heat-dissipating fin structure that reduces internal temperature by 15°C compared to steel housings, preventing coil overheating in high-temperature environments (up to 120°C underhood).

Bearings: Dual sealed ball bearings (SKF brand) with a rated life of 50,000 hours—resisting oil contamination and vibration (tested to 20g acceleration at 10–2000Hz) and eliminating the need for mid-service bearing replacement.

Brushes: High-carbon copper brushes (with a 12mm wear length) that maintain consistent contact with the rotor slip rings, ensuring reliable power transmission even after 30,000 hours of operation (equivalent to 1.2 million km of truck use)

To safeguard the alternator and the engine’s electrical system from damage, the unit integrates multiple safety mechanisms:

Overcurrent Protection: A built-in circuit breaker that cuts off output when current exceeds 180A (e.g., due to a short circuit in the wiring harness), preventing stator coil burnout.

Overvoltage Protection: A voltage regulator that shuts down power generation if output voltage exceeds 14.8V, protecting sensitive components like the ECU and battery from voltage spikes.

Reverse Polarity Protection: A diode rectifier bridge that blocks current flow if the battery is connected incorrectly, avoiding damage to the alternator’s internal circuits and the engine’s fuse box.

These safety features meet ISO 16750 automotive electrical standards and Cummins’ internal quality requirements, ensuring the alternator operates safely in all operating conditions

Designed for efficient replacement by engine technicians, the alternator simplifies installation and maintenance with user-friendly features:

Direct Wiring Compatibility: The 4-pin weatherproof connector (Deutsch DT series) matches the engine’s factory wiring harness—no cutting, soldering, or adapter harnesses required, and color-coded wires (red for positive, black for ground, blue for signal) ensure error-free connection.

No Pre-Installation Calibration: As an OEM component, the alternator is pre-calibrated to Cummins’ specifications, so it works immediately after installation without the need for ECU programming or voltage adjustment.

Low Maintenance Design: The sealed bearings and long-life brushes eliminate the need for periodic lubrication or brush replacement, reducing maintenance time and costs.

Installation takes 45–60 minutes: remove the serpentine belt, unbolt the old alternator (using a 13mm socket), disconnect the wiring connector, mount the new alternator, reattach the belt, and torque the mounting bolts to 40 N·m (per Cummins guidelines). Each unit undergoes 100% performance testing (output current, voltage regulation, noise level) and quality inspection, backed by a 24-month OEM warranty against defects (e.g., bearing failure, voltage regulator malfunction, coil damage)