🔧 F-350 Super Duty - Battery Replacement

Replacing the 12V battery restores reliable starting and prevents weird electrical issues (slow crank, warning lights, random module glitches). On your F-350, the battery sits in the engine bay and is held down with a clamp/bolt.

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

---

⚠️ Safety & Precautions

• 🔋 Wear eye protection and gloves; batteries can vent corrosive acid.
• ⚡ Never let a tool bridge the battery positive to metal (it can arc hard).
• 🔥 Keep sparks/flames away from the battery area.
• 🧠 Disconnect the negative (-) cable first and reconnect it last to reduce short-circuit risk.
• 📌 Assumption: your A/C, radio, and memory settings may reset unless you use a memory saver.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Fender cover
• 8mm socket
• 10mm socket
• Ratchet (3/8")
• 6" extension (3/8")
• Battery terminal puller (specialty)
• Battery terminal cleaning brush
• Digital multimeter
• OBD-II memory saver (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (Group 65, 750+ CCA) - Qty: 1
• Battery terminal anti-corrosion spray - Qty: 1
• Battery terminal felt washers - Qty: 1 kit

---

📋 Before You Begin

• Park on level ground, shift to P, and set the parking brake.
• Turn everything off and remove the key (or keep the fob away from the truck).
• If you want to keep radio presets and module memory, plug in an OBD-II memory saver (a small 12V backup that powers the truck while the battery is out).
• Pop the hood and let the engine bay cool if it’s hot.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the battery and remove any covers

• Open the hood and locate the battery at the front side of the engine bay.
• If there’s a plastic battery cover, remove it by hand or use an 8mm socket if it’s bolted on.

Step 2: Disconnect the negative (-) battery cable

• Use an 8mm socket with a ratchet (3/8") to loosen the negative terminal clamp.
• Twist the clamp gently and lift it off the battery post.
• Tip: Tuck it aside so it can’t spring back.

Step 3: Disconnect the positive (+) battery cable

• Use an 8mm socket with a ratchet (3/8") to loosen the positive terminal clamp.
• Lift the clamp off the post and position it away from the battery.
• If the clamp is stuck, use a battery terminal puller (specialty) (a small screw tool that pushes the clamp off without prying).

Step 4: Remove the battery hold-down

• At the base of the battery, remove the hold-down bolt using a 10mm socket, ratchet (3/8"), and 6" extension (3/8") if needed.
• Lift out the hold-down bracket/wedge.
• Torque to 5 Nm (4 ft-lbs) when reinstalling.

Step 5: Remove the old battery

• Lift the battery straight up and out. Batteries are heavy—use good posture.
• Set it on the ground upright (don’t tip it).

Step 6: Clean the tray and terminals

• Inspect the battery tray for corrosion and clean it.
• Use a battery terminal cleaning brush to clean the inside of both cable clamps until shiny.

Step 7: Install the new battery and secure it

• Lower the new battery into the tray in the same orientation as the old one.
• Reinstall the hold-down bracket and tighten using a 10mm socket and ratchet (3/8").
• Torque to 5 Nm (4 ft-lbs).

Step 8: Reconnect the positive (+) cable, then the negative (-) cable

• Install the positive clamp first and tighten using an 8mm socket and ratchet (3/8").
• Torque to 7 Nm (5 ft-lbs).
• Install the negative clamp last and tighten using an 8mm socket and ratchet (3/8").
• Torque to 7 Nm (5 ft-lbs).
• Spray terminals with battery terminal anti-corrosion spray.

Step 9: Reset the Battery Monitoring System (if equipped)

• Method A (no scan tool): Key ON (engine OFF), then flash high beams 5 times, then press the brake pedal 3 times within 10 seconds.
• Method B (scan tool): Use a capable scan tool and run the battery monitoring reset function.
• If the battery light or charging messages appear, recheck terminal tightness and cleanliness.

---

✅ After Repair

• Start the truck and verify normal cranking.
• Use a digital multimeter across the battery posts with the engine running: you should typically see about 13.5V-14.7V.
• Check that headlights, power windows, and locks work normally.
• If memory was lost, reset clock and radio presets.

---

💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $160-$320 (parts only)

You Save: $60-$180 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.

---

🎯 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.