12V 37A Alternator Carrier Thermo King SB SB-II SB-III SMX RD 45-2254 30-50337-00
12V 37A Alternator Carrier Thermo King SB SB-II SB-III SMX RD 45-2254 30-50337-00
SKU:400-16160
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Alternator 12V 37A IR/EF (SKU: 45-2254)
Heavy-Duty Replacement for Carrier & Thermo King Refrigeration
Maintain the critical cooling performance of your transport refrigeration system with this premium 37 Amp alternator. Specifically engineered for the high-vibration environment of diesel-powered refrigeration units, this part provides consistent electrical output to keep your electronics and battery systems powered during long hauls.
Key Features
- ✔ IR/EF (Internal Regulator / External Fan)
- ✔ Direct fit for Carrier & Thermo King units
- ✔ Heavy-duty bearings for extended service life
- ✔ High-grade copper windings
Technical Specs
| Voltage: | 12V |
| Amperage: | 37A |
| Rotation: | CW (Clockwise) |
| Regulator: | Internal (IR) |
| Fan: | External (EF) |
| B+ Terminal: | M6-1.0 |
Compatibility / Fitment Guide
| Brand | Application / Models | Engine Type |
|---|---|---|
| Thermo King | SB-190, SB-200, SB-210, SB-300, SB-310, SB-II, SB-III, Sentry, SMX, Super II, MD-II, RD-II | Yanmar 3.53L / 4.82L / 4.86L |
| Carrier Transicold | JD, MD, RD Series Units | CT4-134, CT4-114 Diesel |
OEM Cross Reference
| Thermo King: | 45-2254, 45-2255, 41-5458, 41-6780, 41-8461, 41-9925, 44-9571 |
| Carrier: | 20-44-9571, 29-50340-00, 30-50337-00, 30-50324-00 |
| Leece Neville: | 110-399, 110-699, 8MR2130D, 8MR2171F, 8MR2175F, 8MR2181L |
| Bosch / Lester: | 0-120-488-296, 0-120-488-297 / 7478, 7479, 7484, 8616 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part from 4Drive, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking the SKU/MPN and Cross Reference list provided above. If your original part number matches any of these, it is a guaranteed fit.
What does IR/EF mean for this alternator?
IR stands for Internal Regulator, and EF stands for External Fan. This is the standard configuration for the 37 Amp Leece Neville type alternators used in Thermo King and Carrier trailer units.
Note: Please verify your original part number against the references above before purchasing. All 4Drive products ship from our UK-based logistics center.
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