A Ford Explorer Owner's Guide to Alternator Replacement (2016-2021)
Is your Explorer showing a 'Check Charging System' light? Here's what you need to know before replacing your alternator.
- The 'Check Charging System' light is a critical warning; do not ignore it.
- After replacement, the Battery Management System (BMS) must be reset, or the warning light may stay on.
- This is a moderately difficult DIY job; the radiator fan assembly must be removed for access.
- Confirm your Explorer's required amperage (e.g., 230A) before buying a replacement part.
Is Your Ford Explorer's Alternator Failing?
When an alternator starts to go bad on a 2016-2021 Ford Explorer, it gives several warning signs. Recognizing them early can prevent you from getting stranded. The most common sign is the 'Check Charging System' warning light on your dashboard. You might also notice your headlights and interior lights dimming or flickering, especially when the engine is idling. Other symptoms include accessories like the radio or power windows acting up or working slowly, and a whining or grinding noise from the engine bay, which often points to failing bearings inside the alternator.
Don't Ignore the Battery Light
The battery warning light means the vehicle is running solely on battery power, which will not last long. It's a critical warning that the charging system has a problem. Continuing to drive will drain the battery completely, leaving you stranded.
Choosing the Right Aftermarket Alternator
When shopping for a new alternator, you have several options. The choice between OEM and aftermarket depends on your budget and how long you plan to keep the vehicle.
- Motorcraft (OEM): This is the original Ford part. It offers the best guarantee of fit, performance, and longevity. While it's the most expensive option, it's the benchmark for quality.
- New Aftermarket (WAI Global, some Remy/MPA lines): Brands like WAI Global offer 100% new units, which eliminates the risk of getting a remanufactured part with worn components. Some users report good experiences, but quality can be inconsistent compared to OEM. These are a good middle-ground option.
- Remanufactured Aftermarket (BBB Industries, MPA, Remy): These are original units that have been rebuilt with new wear-and-tear components like bearings and brushes. Brands like BBB Industries are major suppliers for auto parts stores. Quality can be very good, but there is a higher chance of receiving a defective unit compared to a new part. They are often the most budget-friendly choice.
Pro Tip: Check the Amperage
Your Explorer may have different alternator amperage ratings (e.g., 175A, 220A, 230A) depending on the engine and options package. Always match the amperage of the new alternator to your original part to ensure it can handle your vehicle's electrical load. The part number is often printed on a sticker on the alternator housing.
What Does an Alternator Replacement Cost?
The cost to replace the alternator on a 2016-2021 Explorer varies based on the part you choose and who does the work. The job is more complex than on older vehicles, requiring removal of the radiator fan assembly for access.
| Item | Estimated Cost |
|---|---|
| New OEM (Motorcraft) Part | $400 - $710 |
| New Aftermarket Part | $85 - $582 |
| Remanufactured Part | $110 - $460 |
| Shop Labor | $195 - $290 |
| Total Professional Replacement (Est.) | $750 - $1,100+ |
Frequently Asked Questions
The charging system light is still on after I replaced the alternator and battery. Why?
The 2016-2021 Explorer uses a Battery Management System (BMS). This system needs to be reset after replacing the battery or alternator so it can relearn the new component's state of charge. If this procedure isn't done, the computer may still think there is a fault. The reset procedure can sometimes be done without a scan tool by following a specific sequence of flashing the high beams and pressing the brake pedal.
Is it hard to replace the alternator myself?
For this specific Explorer generation, it is a moderately difficult job that can take 4-6 hours for an experienced DIYer. Access is tight, and it requires removing the air intake tube and the radiator fan assembly. While it is possible to do at home with the right tools, it is more involved than on many other vehicles.
Was there a recall on the alternator for these years?
Based on searches of the NHTSA database, there are no widespread official recalls specifically for the alternator on the 2016-2021 Ford Explorer models. Always check for the latest information using your vehicle's VIN on the NHTSA website.
How do I know if it's the alternator or just a bad battery?
A simple test is to jump-start the vehicle. If the engine starts but dies immediately after the jumper cables are removed, the alternator is very likely the problem because it isn't generating power to keep the engine running. If the car stays running but won't start again later on its own, the battery is more likely the culprit (though a bad alternator can damage a battery over time).
Technical Specifications
OEM Part Numbers: GB5Z-10346-A GL-8787 M1MZ-10346-A
Common amperages for the 3.5L V6 are 175A, 220A, and 230A. The alternator uses a 6-groove pulley and has a clockwise rotation.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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