🔧 Accord - Alternator Replacement

Your alternator charges the battery and powers the electrical system while the engine runs. If it’s failing, you may see a battery light, dim lights, or a no-start after driving. On your Accord, the alternator is belt-driven on the front of the engine and can be replaced with basic hand tools.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

---

⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable first to prevent a short at the alternator power stud.
• ⚠️ Work on a cool engine; keep hands clear of the belt and pulleys.
• ⚠️ Support the hood securely and keep loose clothing away from rotating parts.
• ⚠️ If you raise the front of the car, use jack stands—never rely on a jack alone.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" drive ratchet
• 3/8" drive extension set
• Serpentine belt tool or 3/8" breaker bar
• Torque wrench (10–80 ft-lbs range)
• Flat trim tool
• Flathead screwdriver

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Alternator - Qty: 1
• Serpentine belt - Qty: 1 (recommended if belt is cracked/glazed)

---

📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• Open the hood and take a quick photo of the belt routing (or sketch it). This makes reassembly much easier.
• If you plan to lift the front, loosen nothing on the belt yet—lift only after you’ve confirmed your jack points.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket to loosen the negative battery terminal and remove it from the battery post.
• Tuck the cable aside so it can’t spring back and touch the post.

Step 2: Remove the air intake ducting (for access)

• Use a flathead screwdriver to loosen the intake hose clamp(s).
• Use a flat trim tool to pop any plastic clips holding the duct/resonator in place (a trim tool is a plastic pry tool that helps avoid breaking clips).
• Lift the ducting out and set it aside.

Step 3: Relieve belt tension and remove the serpentine belt

• Place a serpentine belt tool or 3/8" breaker bar on the belt tensioner arm.
• Rotate the tensioner to relieve tension, then slide the belt off the alternator pulley.
• Slowly release the tensioner back to its resting position.
• Tip: Keep fingers out of pinch points.

Step 4: Disconnect alternator electrical connections

• Unplug the alternator electrical connector by pressing the tab and pulling it off by hand.
• Remove the rubber protective boot over the alternator power stud.
• Use a 10mm socket to remove the nut from the B+ (main power) terminal and lift the ring terminal off.
• When reinstalling the B+ nut: Torque to 10 Nm (7 ft-lbs)

Step 5: Remove the alternator mounting bolts

• Use a 12mm socket and 3/8" drive ratchet with a 3/8" drive extension as needed to remove the alternator mounting bolts.
• Support the alternator with one hand as you remove the last bolt so it doesn’t drop.
• Lift the alternator out from the top. If it feels stuck, wiggle it gently—don’t pry on the aluminum bracket.

Step 6: Install the new alternator

• Set the new alternator into position and start the mounting bolts by hand (this prevents cross-threading).
• Use a 12mm socket to snug the bolts evenly.
• Use a torque wrench (10–80 ft-lbs range) to finish tightening: Torque alternator mounting bolts to 44 Nm (33 ft-lbs)

Step 7: Reconnect alternator wiring

• Install the main power ring terminal onto the alternator stud and thread the nut on by hand.
• Use a 10mm socket and then a torque wrench: Torque to 10 Nm (7 ft-lbs)
• Reinstall the rubber boot over the power stud.
• Plug the alternator connector back in until it clicks.

Step 8: Reinstall the serpentine belt

• Route the belt according to your photo/sketch.
• Use a serpentine belt tool or 3/8" breaker bar to rotate the tensioner and slip the belt over the alternator pulley last.
• Release the tensioner slowly.
• Visually check that the belt is fully seated in every pulley groove.

Step 9: Reinstall the air intake ducting

• Reinstall the intake duct/resonator.
• Use a flathead screwdriver to tighten the hose clamp(s).
• Reinstall any clips using the flat trim tool if needed.

Step 10: Reconnect the battery

• Install the negative terminal back onto the battery post.
• Use a 10mm socket to tighten it snugly (do not overtighten).

---

✅ After Repair

• Start the engine and confirm the battery/charging warning light is off.
• Listen for belt squeal or slapping; shut off the engine if you hear it and re-check belt seating.
• If you have a multimeter, check charging voltage at the battery with the engine running: typically about 13.8–14.7V.
• Reset the clock and radio presets if they were lost.

---

💰 DIY vs Shop Cost

Shop Cost: $500-$900 (parts + labor)

DIY Cost: $180-$450 (parts only)

You Save: $320-$450 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 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.