🔧 Wrangler - Battery Replacement

On your Wrangler, the 12V battery sits under the hood and supplies power for starting and all electronics. Replacing it is straightforward, but the key is disconnecting and reconnecting the terminals in the correct order to prevent shorts.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Turn ignition OFF and remove the key before starting.
• ⚠️ Disconnect the negative (-) terminal first to reduce short-circuit risk.
• ⚠️ Keep tools away from both battery posts at the same time.
• ⚠️ Batteries can vent hydrogen gas—no sparks, smoking, or open flames.
• ⚠️ Wear eye protection and gloves; battery acid can burn skin and eyes.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 13mm socket
• 3/8" ratchet
• 6" socket extension (3/8")
• Torque wrench (in-lb or Nm)
• Battery terminal cleaning brush
• Trim/panel tool
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V starting battery (Group size 34, 650+ CCA) - Qty: 1
• Battery terminal anti-corrosion spray - Qty: 1
• Battery terminal felt washers - Qty: 2

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and locate the battery on the passenger-side of the engine bay.
• If you want to preserve radio presets/clock, you can note them now. Expect settings to reset.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the battery

• Open the hood and identify the negative (-) cable (usually black) and positive (+) cable (usually red with a cover).
• If a plastic cover blocks access, release it carefully using a trim/panel tool.

Step 2: Disconnect the negative (-) terminal

• Use a 10mm socket with a 3/8" ratchet to loosen the negative terminal clamp bolt.
• Twist and lift the clamp off the battery post, then tuck the cable aside so it cannot spring back.
• A “terminal clamp” is the metal ring that grips the battery post.

Step 3: Disconnect the positive (+) terminal

• Flip open/remove the red protective cover (if equipped).
• Use a 10mm socket with a 3/8" ratchet to loosen the positive terminal clamp bolt.
• Remove the clamp and position the cable safely away from the battery.

Step 4: Remove the battery hold-down

• At the base of the battery, remove the hold-down bolt using a 13mm socket, 6" extension, and 3/8" ratchet.
• Lift out the hold-down bracket and set it aside.

Step 5: Remove the old battery

• Lift the battery straight up and out. It’s heavy—lift with your legs.
• Set it on the ground upright (never on its side).

Step 6: Clean and prep the terminals and tray

• Use a battery terminal cleaning brush to clean the inside of both cable clamps until shiny.
• Clean any corrosion in the tray area, then install battery terminal felt washers onto the new battery posts (one per post).

Step 7: Install the new battery

• Place the new battery into the tray in the same orientation as the old one (posts in the same positions).
• Reinstall the hold-down bracket and tighten the bolt using a 13mm socket and torque wrench: Torque to 17 Nm (150 in-lbs).

Step 8: Reconnect the positive (+) terminal first

• Install the positive clamp fully down onto the post.
• Tighten the clamp bolt using a 10mm socket and torque wrench: Torque to 5 Nm (44 in-lbs).
• Reinstall/close the red protective cover.

Step 9: Reconnect the negative (-) terminal

• Install the negative clamp fully down onto the post.
• Tighten the clamp bolt using a 10mm socket and torque wrench: Torque to 5 Nm (44 in-lbs).
• Lightly spray both terminals with battery terminal anti-corrosion spray.

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✅ After Repair

• Start the engine and confirm it cranks strongly.
• Check that the battery is secure (no movement) and cables are tight (no hand-rotation on posts).
• Reset the clock and radio presets if needed.
• If you see a battery/charging warning light, stop and recheck terminal tightness and corrosion.

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💰 DIY vs Shop Cost

Shop Cost: $220-$420 (battery + install)

DIY Cost: $160-$300 (parts only)

You Save: $60-$120 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?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.