31 Electrical parts are listed for the 2018 Freightliner 108SD, in 3 part types, covering the 6.7L L6 DIESEL Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2018 Freightliner 108SD, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. All 31 listed parts are Alternator / Generator (20 parts), Starter Motor (6 parts) and Battery (5 parts).
The 2018 Freightliner 108SD came with a single engine, the 6.7L L6 DIESEL Turbocharged, and every part is verified against it.
7 brands supply electrical parts for the 2018 Freightliner 108SD, led by TERREPOWER (17 parts), WAI GLOBAL (7 parts) and BOSCH (2 parts), plus 4 more brands. Quality grades include New and Remanufactured.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Freightliner 108SD. 7 parts have it, including WAI GLOBAL 8741N (Alternator / Generator) and FVP P31TAGM (Battery). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular | 8741N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Popular | 8614N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Popular | 8681N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| BOSCH | AL9961LH | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| BOSCH | AL9962SB | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| TERREPOWER | 90014723N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| TERREPOWER | 90014720N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| TERREPOWER | 90014516N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| TERREPOWER | 90047134N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL | 8912N | 🇺🇸 US 🇨🇦 CA | Does Not Include Pulley | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TERREPOWER Popular | 90014516 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER | 90014742 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 90014720 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER | 90014723 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER | 90014730 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER | 90047134 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER | 90014741 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 90014699 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 90014693 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 90014748 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes 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.
20 Alternator / Generator parts for the 2018 Freightliner 108SD come from 3 brands — TERREPOWER, WAI GLOBAL and BOSCH. The "Popular" part is WAI GLOBAL 8741N.
The New section lists 10 options from WAI GLOBAL, TERREPOWER and BOSCH — brand-new units rather than rebuilt ones. WAI GLOBAL 8741N is listed in this group.
The Remanufactured section lists 10 options from TERREPOWER — factory-rebuilt units with new wear components. TERREPOWER 90014516 is listed in this group.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular | P31TAGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 31T | View on Amazon |
| ACDELCO | 31XAGMT | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 31 | View on Amazon |
| EXIDE | XRF31D | 🇺🇸 US 🇨🇦 CA | RoadforceBCI Group 31 | View on Amazon |
| FVP | PC318STAGM | 🇺🇸 US 🇨🇦 CA | Platinum AGM | View on Amazon |
| MOTORCRAFT | 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 2018 Freightliner 108SD, from FVP, ACDELCO, EXIDE and 1 other brand. FVP P31TAGM carries the "Popular" badge.
Part numbers include FVP P31TAGM, ACDELCO 31XAGMT and EXIDE XRF31D, among others listed above.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular | 6809N | 🇺🇸 US 🇨🇦 CA | Optional Replacement Delco 38MTwith Integral Magnetic Switch | View on Amazon |
| WAI GLOBAL | 6963N | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WAI GLOBAL | 34029N | 🇺🇸 US 🇨🇦 CA | without Ground Stud | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TERREPOWER Popular | 91014623 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 91014779 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 91047848 | 🇺🇸 US 🇨🇦 CA | Remanufactured | 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.
6 Starter Motor parts for the 2018 Freightliner 108SD come from 2 brands — WAI GLOBAL and TERREPOWER. The "Popular" part is WAI GLOBAL 6809N.
The New section: 3 options from WAI GLOBAL. WAI GLOBAL 6809N is listed in this group.
The Remanufactured section: 3 options from TERREPOWER. TERREPOWER 91014623 is listed in this group.
Part numbers include WAI GLOBAL 6809N, WAI GLOBAL 6963N and WAI GLOBAL 34029N, among others listed above.
Buying Electrical Parts for a 2018 Freightliner 108SD
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.
- Confirm you have the 6.7L L6 DIESEL Turbocharged engine — every part on this page is matched to it.
- 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 Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2018 Freightliner 108SD?
Our catalog currently lists 31 electrical parts for the 2018 Freightliner 108SD across 3 subcategories and 7 brands, covering the 6.7L L6 DIESEL Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2018 Freightliner 108SD?
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 2018 Freightliner 108SD 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 2018 Freightliner 108SD?
Every part on this page is matched to the 6.7L L6 DIESEL Turbocharged engine. 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 2018 Freightliner 108SD
Electrical Parts for Other Freightliner 108SD Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.