1500 Classic - Taillight Bulb Replacement 💡

I’ll walk you through changing both rear taillight (running/parking) bulbs on your 1500 Classic. This also shows you how to reach the other bulbs in the same housing.

Safety First ⚠️

• 🧤 Park safely: Flat ground, engine off, parking brake on.
• 🔌 Key off and lights off: Prevent short circuits and hot bulbs.
• 🧊 Let bulbs cool: They can be hot if just used.

Parts You’ll Need 📦

For a 2020 1500 Classic SLT (U.S.-spec style):

• 💡 Taillight / parking light bulbs: Typically 3057 or 3157 type dual-filament bulbs (used for tail + brake/turn depending on market). Check the number printed on your old bulb base and match it.
• 💡 Optional: new reverse (backup) bulbs if you want to refresh everything while it’s apart.

If the number on your bulb is different (like 7443, etc.), use that exact number as replacement.

Tools You’ll Need 🧰

• 🔧 T25 Torx screwdriver or bit Torx = star-shaped screw head used on many trucks.
• 🔧 Ratchet and T25 Torx bit (optional, but easier than a small screwdriver)
• 🧤 Clean gloves Helps keep skin oils off the bulbs.
• 🪛 Plastic trim tool (optional) A plastic prying tool that won’t scratch paint.

Taillight Assembly Removal (One Side) 🚚

Do one side at a time so you can look at the other side if you get confused.

1. Open the tailgate. The taillight mounting screws are on the inside edge of the bed, only visible with the tailgate down.
2. Locate the two Torx screws. You’ll see two T25 Torx screws running vertically along the inner edge of the taillight.
3. Remove the two screws. 🔧 Turn counterclockwise and set the screws somewhere safe. These are small; don’t drop them into the bed gap.
4. Pull the taillight straight back. 💪 The outer edge is held by plastic alignment pins that push into clips in the bed side.
   • Grab the taillight at the top and bottom.
   • Pull straight back toward you, not sideways.
   • It may feel stuck; wiggle gently while pulling.
   Don’t yank hard; you don’t want to crack the housing.
5. Support the taillight. Once it pops free, support it with one hand so the wiring isn’t hanging by itself.

Accessing the Bulbs 💡

On the back of the taillight you’ll see several bulb sockets.

• 🔌 Taillight / brake / turn bulb socket: Usually the larger socket near the middle or top.
• 🔌 Reverse bulb socket: Usually the smaller socket near the bottom (clear lens area).

1. Identify the taillight bulb socket. This is the one that lights up red when your parking lights are on.
2. Twist the socket counterclockwise about ¼ turn and pull it straight out of the housing.
3. Remove the old bulb. Most of these are push-in wedge bulbs:
   • Grasp the bulb and pull it straight out of the socket.
   • If it’s stuck, wiggle gently while pulling.

Installing the New Taillight Bulb ✅

1. Match the new bulb. Check the number on the old bulb (e.g., 3057 or 3157) and make sure the new one is the same.
2. Install the new bulb. Push the new bulb straight into the socket until it seats firmly.
3. Reinstall the socket. Line up the tabs on the socket with the slots in the taillight housing, insert, and twist clockwise ¼ turn until it stops.
4. Test the bulb before reassembly. 🔍
   • Have a helper turn on the parking lights.
   • Check that the new bulb lights up.
   • If it’s a dual-filament bulb (tail + brake/turn), also press the brake pedal and use the turn signal to confirm both functions work.
   If it doesn’t light, turn the bulb 180° and reinsert (for some aftermarket LED types).

Reinstalling the Taillight Assembly 🔩

1. Align the locating pins. On the back of the taillight, you’ll see plastic pins that go into metal clips in the bed side. Line them up with the holes.
2. Push the taillight straight in. Press firmly until it snaps into place and sits flush with the body.
3. Reinstall the two Torx screws. 🔧 Turn them clockwise until snug.
   • Torque spec: about 20–25 in-lb (hand snug with a small driver).
   • Do not overtighten or you can crack the plastic.
4. Close the tailgate and check that the gaps around the taillight look even.

Repeat on the Other Side 🔁

Do the exact same steps on the other taillight to replace the second bulb.

Final Checks ✅

• 💡 Turn on parking lights – both taillights should glow evenly.
• 🚦 Press brake pedal – both sides bright and equal.
• ↪️ Use turn signals – left and right flash correctly.
• 🔙 Put in reverse (engine running, foot on brake) – reverse lights work (if you changed them).

Tips & Tricks 🧠

• 🧽 Clean the lens and seals while the light is off the truck to help prevent moisture.
• 🧤 Avoid touching glass on halogen bulbs with bare fingers; oil can shorten bulb life.
• 💡 If you upgrade to LEDs, make sure they are CAN-bus compatible to avoid bulb-out warnings or fast flashing.

If you tell me the number printed on your current taillight bulbs, I can confirm the exact replacement type and suggest good-quality options.

HowToo makes it easy: below this answer you’ll see compatible bulbs and tools you can order with fast shipping. You can add them to your cart right from the parts section.