English
This 24V 50A 7PK alternator is designed as a direct-fit replacement for ISUZU FRD90 and FRR90 trucks equipped with either the 6HK1 or 4HK1 diesel engine (2008–2014). With a robust 50-amp output, it reliably powers demanding electrical systems—including ABS, engine management, air conditioning compressors, telematics, and auxiliary lighting—under extended duty cycles and high-temperature environments common in regional haul and distribution applications.
The unit features a precision-machined 7PK pulley (69mm diameter) that matches OEM geometry for optimal belt tracking, reduced vibration, and extended serpentine belt life. It is fully cross-referenced with major OEM and aftermarket part numbers, including:
WAI 21659N, ISUZU 8974816970 / 8976880320 / 8980134550 / 8980134551 / 8983176680, NIKKO 0350000712 / 0350000713 / 0350000800 / 0350004818 / 0350004628 / 0350004638, and legacy references such as ALK4848 / ALK4848LP / ALK4848YJ / ALK4848WA.
Manufactured by SANYOU under stringent quality control, this alternator is built with 100% new components: high-efficiency copper windings, thermally stable rectifier diodes, IC voltage regulators with over-voltage protection, and double-shielded bearings rated for 10,000+ operating hours. Each unit undergoes dynamic load testing (≥50A at 1,500 RPM), ripple analysis (<200mV), and thermal endurance validation to ensure performance and durability that meet or exceed ISUZU factory specifications.
Mounting Dimensions
Specifications
OEM NO.
Applications

| Specifications | MFR | NIKKO |
| Voltage | 24 | |
| Amp. | 50 | |
| Grooves | 7 | |
| Pulley | 69 |
| Producer | Number |
| WAI | 21659N |
| ISUZU | 8974816970, 8976880320, 8980134550, 8980134551, 8983176680 |
| NIKKO | 0350000712, 0350000713, 0350000800, 0350004818,0350004628, 0350004638 |
KEEP IN TOUCH
Our factory specializes in producing starters, generators, and spare parts for automobiles, tractors, and internal combustion engines. We possess advanced production and processing technology, complete equipment, and rigorous testing methods. Through years of hard work and entrepreneurship, we have gradually developed into a company of considerable scale and strength. Our "Xiyun" brand has gained considerable influence in the industry, OE NIKKO 24V 50A Alternator for ISUZU FRD90 & FRR90 – Compatible with 21659N, 7PK69mm, and our products are sold throughout China. Some of our parts are exported to the United States, Canada, Russia, Brazil, and other countries, enjoying widespread popularity and praise from users.
Our factory currently has fixed assets of over 5 million RMB, working capital of over 4 million RMB, covering an area of over 20,000 square meters, with a building area of over 12,000 square meters. We currently produce DC starters and AC generators for construction machinery. Custom NIKKO 24V 50A Alternator for ISUZU FRD90 & FRR90 – Compatible with 21659N, 7PK69mm. Our main equipment includes 2 large hydraulic presses, 5 medium and small hydraulic presses, over 30 machine tools such as lathes, grinders, and milling machines, and over 50 sets of various specialized testing equipment. We have over 60 employees, including 3 engineers, 5 technicians, and 9 full-time technical personnel. Currently, the factory has an annual production capacity of over 150,000 starters, over 200,000 generators, over 150,000 armatures, and over 150,000 electromagnetic switches.
Our factory has a sound organizational structure. The factory has five management departments: quality inspection, technology, production, sales and marketing, and finance; and three workshops: generator assembly, starter assembly, and machining. Various organizational management regulations and training plans are being further improved to ensure high-efficiency and high-quality production.
Our factory passed ISO9000 international quality system certification in December 2000, was rated as an AAA-level credit enterprise in 2001, and passed IATF16949 certification in 2023. Currently, our factory supplies main engine manufacturers including Shanghai Diesel Engine Factory, Nantong Diesel Engine Factory, Guiyang Diesel Engine Factory, Wuxi Power Engineering Co., Ltd., and Tianjin Power Machinery Factory. Our factory will steadfastly implement the principles of "quality first, customer foremost, strict management, and brand creation," providing our customers with superior products through sincere service and excellent quality.
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