🔧 Fusion - 12V Battery Replacement

This repair replaces the 12-volt starting battery in your Fusion. A weak battery can cause slow cranking, warning lights, no-start issues, and electrical glitches.

Difficulty Level: Beginner | Estimated Time: 20-40 minutes

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⚠️ Safety & Precautions

• ⚠️ Wear safety glasses and gloves. Car batteries contain acid and can spark if handled incorrectly.
• ⚠️ Always remove the negative cable first and reconnect it last. This lowers the chance of an accidental short.
• ⚠️ Do not let a wrench touch both battery terminals, or the positive terminal and metal body, at the same time.
• ⚠️ Keep flames, cigarettes, and sparks away from the battery area.
• ⚠️ The battery is heavy. Lift with both hands and keep it upright.
• ⚠️ Battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 10mm wrench
• 8mm socket
• Ratchet handle 3/8-inch drive
• Socket extension 6-inch 3/8-inch drive
• Battery terminal puller (specialty)
• Battery terminal cleaning brush
• Battery memory saver OBD-II 12V (specialty)
• Digital multimeter
• Battery carrying strap
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V starting battery - Qty: 1
• Battery terminal protectant - Qty: 1
• Battery terminal anti-corrosion washers - Qty: 2

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📋 Before You Begin

• Park your Fusion on level ground, shift to Park, and set the parking brake.
• Turn off the ignition, headlights, interior lights, radio, climate controls, and all accessories.
• Open the hood and let the vehicle sit for at least 3 minutes so modules can power down.
• If using a memory saver, plug the battery memory saver OBD-II 12V into the OBD-II port before disconnecting the battery. A memory saver keeps small electrical settings alive while the battery is disconnected.
• Know your radio presets and clock may reset if you do not use a memory saver.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the Battery

• Open the hood and support it securely.
• The battery is in the engine compartment on the driver-side front area.
• Use safety glasses and nitrile gloves before touching the battery.
• Take a photo before disconnecting.

Step 2: Remove the Negative Battery Cable

• Find the negative terminal. It is marked with a minus sign “-” and usually has a black cable.
• Use a 10mm socket or 10mm wrench to loosen the negative terminal clamp nut.
• Twist the cable end gently and lift it off the battery post.
• If the cable is stuck, use a battery terminal puller (specialty). A terminal puller gently lifts the clamp without damaging the battery post.
• Move the cable away so it cannot spring back onto the battery post.

Step 3: Remove the Positive Battery Cable

• Find the positive terminal. It is marked with a plus sign “+” and usually has a red cover.
• Lift the red protective cover by hand.
• Use a 10mm socket or 10mm wrench to loosen the positive terminal clamp nut.
• Lift the positive cable off the battery post and move it aside.
• Do not let the positive cable touch bare metal.

Step 4: Remove the Battery Hold-Down

• The hold-down bracket keeps the battery from moving while driving.
• Use an 8mm socket, ratchet handle 3/8-inch drive, and socket extension 6-inch 3/8-inch drive to remove the hold-down bolt and bracket.
• Place the bolt and bracket somewhere safe so they do not fall into the engine bay.

Step 5: Remove the Old Battery

• Attach a battery carrying strap if the battery does not have a handle.
• Lift the battery straight up and out with both hands.
• Keep the battery upright at all times.
• Set it on cardboard or a stable surface, not directly on painted body panels.

Step 6: Clean the Battery Tray and Cable Ends

• Inspect the battery tray for dirt, acid residue, or corrosion.
• Use a battery terminal cleaning brush to clean the inside of both cable clamps.
• If there is white or green powder, clean gently and avoid breathing the dust.
• Clean metal makes better electrical contact.

Step 7: Install the New Battery

• Use the battery carrying strap to lower the new battery into the tray.
• Make sure the positive and negative posts are in the same position as the old battery.
• Install the battery hold-down bracket.
• Use the 8mm socket, ratchet handle 3/8-inch drive, and socket extension 6-inch 3/8-inch drive to tighten the hold-down bolt until secure.
• Torque to 8 Nm (71 in-lbs)

Step 8: Install Anti-Corrosion Protection

• Place one battery terminal anti-corrosion washer over each battery post.
• Use battery terminal protectant lightly on the posts and cable ends after the cables are tightened.
• Do not coat the terminals before tightening if it prevents clean metal contact.

Step 9: Reconnect the Positive Cable First

• Push the positive cable clamp fully down onto the positive battery post.
• Use a 10mm socket or 10mm wrench to tighten the clamp nut.
• Torque to 5 Nm (44 in-lbs)
• Close the red protective cover over the positive terminal.

Step 10: Reconnect the Negative Cable Last

• Push the negative cable clamp fully down onto the negative battery post.
• Use a 10mm socket or 10mm wrench to tighten the clamp nut.
• Torque to 5 Nm (44 in-lbs)
• A small spark may happen when reconnecting. This can be normal.

Step 11: Check Battery Voltage

• Use a digital multimeter set to DC volts.
• Touch the red meter lead to the positive battery post and the black meter lead to the negative battery post.
• A healthy fully charged battery should read about 12.6 volts with the engine off.
• Start the engine and check again. Charging voltage should usually be about 13.5-14.8 volts.

Step 12: Reset the Battery Monitoring System

• Your Fusion uses a battery monitoring system that tracks battery age and charging behavior.
• Close all doors, turn off all accessories, and sit in the driver seat.
• Turn ignition to ON without starting the engine.
• Use the headlight switch and ignition sequence carefully:
• Within 10 seconds, flash the high beams 5 times using the turn-signal stalk, then press and release the brake pedal 3 times.
• Watch the battery warning light. It should flash to confirm the reset.
• If the light does not flash, repeat the sequence once from the beginning.

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✅ After Repair

• Start your Fusion and make sure it cranks strongly.
• Check that the battery is secure and does not move by hand.
• Make sure both cable clamps are fully seated and tight.
• Reset the clock, radio presets, and window auto-up feature if needed.
• To relearn the auto window, hold the window switch down until fully open, then hold it up until fully closed, and keep holding for 2 extra seconds.
• Recycle the old battery at a parts store or recycling center. Do not throw it in household trash.

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💰 DIY vs Shop Cost

Shop Cost: $220-$420 (parts + labor)

DIY Cost: $140-$260 (parts only)

You Save: $80-$160 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

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