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Ford Expedition 12V Automotive Battery Replacement Guide
How to change a weak or dead 12 volt car battery in a 4th generation 2018, 2019 and 2020 Ford Expedition SUV.

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2018 Expedition 3.5L V6
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12V Automotive Battery
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Hold Down Clamp
This automotive maintenance tutorial was specifically written to assist owners of the 4th generation (2018, 2019, 2020 and probably also the 2021, 2022 and 2023 model years) Ford Expedition SUV in changing a weak or dead 12 volt car battery for the EcoBoost 3.5 liter turbocharged V6 engine.

Owners of other Ford or Lincoln vehicles such as the Explorer, F-150, Escape, EcoSport, Transit, F-350, F-250, Edge, Flex, Ranger, Fiesta, Focus, Fusion, Mustang, Bronco, Super Duty, Navigator, Continental, MKZ, MKX, MKC, MKT, Aviator, Corsair and Nautilus may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) 12V battery "Group Size" is 94R (also known as H7) and the genuine Ford part number is FoMoCo BAGM-94RH7-800 AGM (absorbed glass mat).

A few compatible replacement aftermarket AGM 12 volt batteries with their part numbers are as follows: Delphi BU9094R, ACDelco 94RAGM, Exide Edge FP-AGML4/94R and EverStart Platinum AGM H7 (Walmart).

The tools needed to complete this procedure include an 8mm socket, a 10mm socket and a 1/4" drive ratchet.

The first two steps are to open the hood and then move to the left (passenger) side of the engine bay.

The 12V automotive battery is situated behind the passenger side headlight housing, in front of the electrical fuse box and next to the blue plastic windshield washer fluid filler cap.



 

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Loosen Counterclockwise
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Lift Out Hold Down Block
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Loosen Negative Terminal
Locate the battery hold down clamp on the left side of the battery near the windshield washer fluid reservoir bottle.

Use an 8mm socket with an extension bar and a 1/4" drive ratchet to loosen the tall grey / silver bolt on the hold down block by turning it in the counterclockwise direction.

Set the battery hold down clamp and bolt aside in a safe place.

Next, loosen the nut on the "-" negative terminal by rotating it a few turns in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet.

You don't need to fully remove the terminal nut, just loosen it three to four turns.

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Pull Off "-" Terminal
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Open Red Plastic Cover
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Loosen Positive Terminal
Carefully pull the negative terminal off the "-" battery post.

Wrap the negative terminal in a small towel and tuck it away on the side of the battery to help prevent accidental electrical contact.

Then pull open the red plastic cover on the positive terminal.

Loosen the positive terminal nut a few turns in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet.

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Pull Off "+" Terminal
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Lift Out Old Battery
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Heat Shield Cover
Pull the positive terminal off the "+" battery post.

Close the red plastic cover and tuck the terminal away on the side of the battery to help prevent accidental electrical contact.

Raise the two plastic handles on the old battery and carefully lift it out of the engine bay.

Try to avoid tipping over the battery or dropping it on the ground to help prevent from having battery acid leak out.

Pull the fabric and foam heat shield off the old battery. Set the battery cover aside for re-installation on to the new battery.

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Clean Off Battery Tray
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Lower In New Battery
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Push On Positive Terminal
Clean off any debris on the black plastic tray in the engine bay so that the new battery will rest evenly on it.

If you can wait a few days for delivery, I recommend buying the Delphi BU9094R AGM (absorbed glass mat) battery since it has excellent reviews on Amazon.

Carefully lower the new battery down into the engine bay and on top of the plastic tray.

The "+" positive battery post should be situated closer to the rear of the vehicle by the plastic cowl and windshield.

The "-" negative terminal should be located closer to the front of the SUV near the passenger side headlight housing.

If you've been having an issue with corrosion (white or blue powder) building up on the terminals or battery posts, install some felt anti-corrosion washers over the battery posts.

First, push the positive terminal (with the red plastic cover) over the "+" battery post.

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Tighten "+" Clockwise
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Push On Red Cover
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Replace Negative Terminal
Tighten the nut on the positive terminal by turning it in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until it is snug.

Avoid over tightening the terminal nut to prevent from damaging the battery post which could lead to an acid leak.

Swing the red plastic cover closed over the positive terminal. The cover should "click" securely into place.

Then lower the negative terminal over the "-" battery post.

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Tighten Negative Terminal
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Hold Down Clamp
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Spin In By Hand
Tighten the nut on the "-" negative terminal by turning it in the clockwise direction with the 10mm socket and a 1/4" drive ratchet.

Lower the hold down clamp down on to the left side of the battery tray near the windshield washer fluid bottle.

Spin in the grey / silver bolt a few turns by hand in the clockwise direction to prevent it from becoming cross threaded.

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Tighten Clockwise
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New Battery Installed
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EcoBoost Turbo 3.5L V6
Continue tightening the bolt on the hold down block by turning it in the clockwise direction with the 8mm socket and a 1/4" drive ratchet until it is snug.

Check to see if the new battery can be moved, slid or rocked on the plastic tray.

If the battery can be moved in any way, make sure the hold down clamp is over the bottom edge of the battery and tighten the 8mm bolt an extra turn or two.

To test the new battery, start the engine, turn on the headlights and flash the high beams.

If you have a digital multimeter, check the voltage of the new battery with the engine off and also with the engine running. When the engine is off, the battery voltage should be just over 12 volts. After starting the engine, the voltage should be in the range of 13V to just over 14V to indicate that the alternator is working properly and charging the battery.

Be sure to write down the battery change in your vehicle's service records.

Please check out all of my 2018-2020 Ford Expedition DIY Repair & Maintenance Guides.
 

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