The 2021 Freightliner 122SD has 14 electrical parts with verified fitment on this page — 3 part types and 5 brands, covering all 3 engine options (12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged and 15.6L DIESEL). Each part includes a manufacturer part number and application notes.
On the 2021 Freightliner 122SD, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. All 14 listed parts are Alternator / Generator (5 parts), Battery (5 parts) and Starter Motor (4 parts).
The 2021 Freightliner 122SD was sold with 3 engines. 5 parts fit every engine; the other 9 are engine-specific. Each part shows which engine(s) it fits.
5 brands supply electrical parts for the 2021 Freightliner 122SD, led by WAI GLOBAL (9 parts), FVP (2 parts) and ACDELCO (1 part), plus 2 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Freightliner 122SD. 2 parts have it, including WAI GLOBAL 8681N (Alternator / Generator) and FVP P31TAGM (Battery). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular Fits: 12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 8681N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 8719N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 8741N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 8614N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 8912N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
5 Alternator / Generator parts for the 2021 Freightliner 122SD come from WAI GLOBAL. The "Popular" part is WAI GLOBAL 8681N.
This group includes WAI GLOBAL 8681N, WAI GLOBAL 8719N and WAI GLOBAL 8741N and the remaining parts above.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular Fits: all 2021 122SD engines | P31TAGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 31T | View on Amazon |
| ACDELCO Fits: all 2021 122SD engines | 31XAGMT | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 31 | View on Amazon |
| EXIDE Fits: all 2021 122SD engines | XRF31D | 🇺🇸 US 🇨🇦 CA | RoadforceBCI Group 31 | View on Amazon |
| FVP Fits: all 2021 122SD engines | PC318STAGM | 🇺🇸 US 🇨🇦 CA | Platinum AGM | View on Amazon |
| MOTORCRAFT Fits: all 2021 122SD engines | BHAGM31 | 🇺🇸 US 🇨🇦 CA | Fleettough/ExtraBCI Group: 31 | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
5 Battery parts are listed for the 2021 Freightliner 122SD, from FVP, ACDELCO, EXIDE and 1 other brand. FVP P31TAGM carries the "Popular" badge. All of them fit every engine offered in the 2021 122SD.
Listed part numbers: FVP P31TAGM, ACDELCO 31XAGMT and EXIDE XRF31D, plus the other parts above.
Starter Motor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Fits: 12.8L L6 DIESEL Turbocharged | 34010N | 🇺🇸 US 🇨🇦 CA | Fits with 150 Tooth Ring Gear Onlyor Optional Replacement with 150 Tooth Ring GearOnly | View on Amazon |
| WAI GLOBAL Fits: 14.9L L6 DIESEL Turbocharged | 6924N | 🇺🇸 US 🇨🇦 CA | Optional ReplacementDelco 39MT Rotatable Drive End Frame | View on Amazon |
| WAI GLOBAL Fits: 14.9L L6 DIESEL Turbocharged | 34043N | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WAI GLOBAL Fits: 14.9L L6 DIESEL Turbocharged | 34046N | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
4 Starter Motor parts for the 2021 Freightliner 122SD come from WAI GLOBAL.
This group includes WAI GLOBAL 34010N, WAI GLOBAL 6924N and WAI GLOBAL 34043N and the remaining parts above.
Buying Electrical Parts for a 2021 Freightliner 122SD
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Match the engine first. Some electrical parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Alternator / Generator and Battery .
Frequently Asked Questions
How many electrical parts fit the 2021 Freightliner 122SD?
Our catalog currently lists 14 electrical parts for the 2021 Freightliner 122SD across 3 subcategories and 5 brands, covering all 3 engine options (12.8L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged and 15.6L DIESEL). Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2021 Freightliner 122SD engines?
Some do. 5 parts fit every engine; the other 9 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical problems on a 2021 Freightliner 122SD?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Freightliner 122SD was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Freightliner 122SD?
First match the engine — each row shows which engine(s) the part fits. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Freightliner 122SD
Electrical Parts for Other Freightliner 122SD Years
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