Air Filter 0342776010 | Cross Reference 03-42776-010, P628541, AF76010 | Heavy Duty Air Filter | Aftermarket

 Thermo King SB Alternator 45-2776 — The Part That Keeps Your Reefer Running

When your Thermo King refrigeration unit starts acting up electrically — battery draining overnight, fault codes on the controller, unit cutting out mid-route — the alternator is almost always where the problem starts. This is especially true in Canada, where a failed reefer in January can mean a full load of spoiled product.

The 45-2776 is a direct-replacement alternator for Thermo King SB Series and Spectrum refrigeration units. It runs at 14 volts and 65 amps, exactly matching the original specification. It mounts where the old one came off, connects the same way, and does the same job.

What This Alternator Does

The alternator in your Thermo King unit generates electrical power while the reefer engine runs. It keeps the battery charged and supplies current to all the electronic control systems — the thermostat, sensors, timers, and fault display that keep your cargo at the right temperature. Without a working alternator, those systems either run on battery alone (which won’t last) or stop working entirely.

At $199 CAD, replacing it proactively is far cheaper than a load rejection and an emergency service call.

Cross Reference — Compatible Part Numbers

This Thermo King SB alternator replaces the following OEM part numbers:

Thermo King primary: 45-2776, 452776, 45-2256, 452256, CA452776

Thermo King cross ref: 44-9572, 41-6781, 41-8463, 44-8949, 44-8525, 841-8463, 41-5457, 45-2255, 45-2254, 45-2589, 45-2597

Additional refs: 449572, 416781, 418463, 448949, 448525, 8418463, 415457, 452255, 452254, 452589, 452597, DD3

Not sure if this fits your unit? Call us at +1 204-962-2971 with your unit model or serial number and we’ll confirm fitment before you spend a dollar.

What Vehicles and Units This Fits

This alternator is built for Thermo King SB Series transport refrigeration units — including SB-I, SB-II, and SB-III configurations — and the Thermo King Spectrum series. These units are mounted on straight trucks and some trailer applications across Canadian fleets.

Signs Your Thermo King Alternator Is Failing

• Battery keeps draining even after a full charge
• Thermo King controller throwing electrical fault codes
• Unit shutting down unexpectedly during transport
• Display flickering or behaving erratically
• Unit starts slowly or struggles to come on when battery is fully charged
• Jump-starting the reefer battery more than once a week

On SB Series units especially, the alternator is a known wear component. It’s not a question of if — it’s a question of when.

Aftermarket Quality — What That Actually Means

This is a new aftermarket alternator — not OEM, not remanufactured. Aftermarket means it’s manufactured to the same electrical specification (14V, 65A) by a third-party supplier rather than Thermo King directly. The mounting points, connectors, and output ratings match the original.

Fleet operators and independent owner-operators across Canada run aftermarket alternators because they get reliable performance without the OEM markup. For a hard-working component that sees regular replacement cycles, aftermarket makes sense.

Ships From Winnipeg — No Border, No Wait

We’re ATS Auto Parts, operating out of Winnipeg, Manitoba. Everything we ship goes out domestically — no customs delays, no currency uncertainty, no two-week waits. Whether you’re running reefer routes through the Prairies, the North, or anywhere in between, we can get this part to you fast.

At $199 CAD, 25 units are in stock and ready to ship today.