This page lists 12 electrical parts for the 2020 Freightliner FL, across 3 part types, covering all 7 engine options (3.0L L4 DIESEL Turbocharged, 3.9L L4 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged and more). Every part shows its brand, manufacturer part number and fitment notes.
On the 2020 Freightliner FL, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. All 12 listed parts are Alternator / Generator (6 parts), Starter Motor (5 parts) and Battery (1 part).
The 2020 Freightliner FL was sold with 7 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2020 Freightliner FL electrical parts are WAI GLOBAL (11 parts) and MOTORCRAFT (1 part).
1 part on this 2020 Freightliner FL page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — WAI GLOBAL 8681N (Alternator / Generator). Click any part number to see every vehicle that part fits.
Alternator / Generator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular Fits: 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 8681N | 🇲🇽 MX | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 8719N | 🇲🇽 MX | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 8741N | 🇲🇽 MX | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 8614N | 🇲🇽 MX | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 8912N | 🇲🇽 MX | Does Not Include Pulley | View on Amazon |
| WAI GLOBAL Fits: 5.1L L4 DIESEL Turbocharged | 8751N | 🇲🇽 MX | 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.
WAI GLOBAL supplies the 6 Alternator / Generator parts for the 2020 Freightliner FL. WAI GLOBAL 8681N carries the "Popular" badge.
Part numbers include WAI GLOBAL 8681N, WAI GLOBAL 8719N and WAI GLOBAL 8741N, among others listed above.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORCRAFT Fits: 3.0L L4 DIESEL Turbocharged, 3.9L L4 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 6.4L L6 DIESEL Turbocharged | BHAGM31 | 🇲🇽 MX | 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.
This group shows a single part: MOTORCRAFT BHAGM31.
Starter Motor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged | 18554N | 🇲🇽 MX | 12V 4.0KW CW 11T G | View on Amazon |
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged | 6849N | 🇲🇽 MX | View on Amazon | |
| WAI GLOBAL Fits: 4.8L L4 DIESEL Turbocharged | 34026N | 🇲🇽 MX | View on Amazon | |
| WAI GLOBAL Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 34042N | 🇲🇽 MX | Detroit DIESEL Direct DRIVE5MOD 3.0 | View on Amazon |
| WAI GLOBAL Fits: 7.2L L6 DIESEL Turbocharged | 6831N | 🇲🇽 MX | 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.
WAI GLOBAL supplies the 5 Starter Motor parts for the 2020 Freightliner FL.
This group includes WAI GLOBAL 18554N, WAI GLOBAL 6849N and WAI GLOBAL 34026N and the remaining parts above.
Buying Electrical Parts for a 2020 Freightliner FL
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. Every electrical part here is 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 Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2020 Freightliner FL?
Our catalog currently lists 12 electrical parts for the 2020 Freightliner FL across 3 subcategories and 2 brands, covering all 7 engine options (3.0L L4 DIESEL Turbocharged, 3.9L L4 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged and more). Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2020 Freightliner FL engines?
Yes. Every electrical part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. 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 2020 Freightliner FL?
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 2020 Freightliner FL 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 2020 Freightliner FL?
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 2020 Freightliner FL
Electrical Parts for Other Freightliner FL Years
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