How to Replace Light Bulbs on a 2026 Harley-Davidson Softail Standard (FXST — M8 107)

Harley-Davidson Softail Standard FXST · 2026 · Light Bulbs

Light Bulb Replacement Guide: 2026 Harley-Davidson Softail Standard FXST

This guide covers every exterior light bulb position on the 2026 Harley-Davidson Softail Standard (FXST), including the headlight, front and rear turn signals, tail/brake light, and license plate light.

Quick Reference Bulb Table

Difficulty & Time Estimate

• Difficulty Level: Beginner (1 out of 5)
• Estimated Time: 20-40 minutes depending on positions replaced
• Best Done: In a well-lit area with the bike on a level surface

Complete Tool List

OEM Part Numbers & Aftermarket Alternatives

Step-by-Step Replacement Instructions

Step 1 — Safety First

1. Park on a level surface; engage the ignition off.
2. Turn the ignition switch to OFF and remove the key.
3. Allow the motorcycle to cool completely before beginning work.
4. Wear nitrile gloves to prevent skin oils from contaminating halogen bulb glass.

Step 2 — Headlight Bulb Replacement (H4 / 9003)

The Softail Standard uses a traditional round sealed H4 bulb behind the headlight bucket.

1. Locate the rubber dust cover on the rear of the headlight bucket.
2. Pull the dust cover straight off by gripping the tab or edge.
3. Disconnect the wiring harness connector by pressing the locking tab and pulling.
4. Release the metal retaining wire clip by squeezing the two ends and pushing up.
5. Carefully pull the old H4 bulb straight out of the socket.
6. Do not touch the glass of the new bulb with bare fingers. Use gloves or a clean cloth.
7. Insert the new H4 bulb with the flat side of the base facing down.
8. Reinstall the retaining wire clip by hooking the bottom first, then pressing down.
9. Reconnect the wiring harness connector until it clicks.
10. Replace the rubber dust cover and ensure it seats fully.

Step 3 — Front Turn Signal Bulbs (1157NA — Amber)

The front turn signals are mounted in the fork lower leg assemblies.

1. Turn the handlebars to access the turn signal you want to replace.
2. Gently pry off the amber lens cover using a flathead screwdriver wrapped in cloth.
3. Push the bulb in slightly and twist counter-clockwise to release from the socket.
4. Pull the old bulb straight out.
5. Insert the new 1157NA amber bulb into the socket and twist clockwise to lock.
6. Press the lens cover back into place until it snaps.
7. Repeat on the other side.

Step 4 — Rear Turn Signal Bulbs (1157NA — Amber)

The rear turn signals are mounted in the rear fender support struts.

1. Loosen the retaining bolt at the base of the turn signal housing.
2. Gently pull the turn signal assembly away from the fender.
3. Remove the rear rubber grommet cover to access the bulb socket.
4. Push the bulb in slightly and twist counter-clockwise to release.
5. Pull the old 1157NA amber bulb out.
6. Insert the new bulb and twist clockwise to lock.
7. Reinstall the rubber grommet cover.
8. Position the assembly back into the fender bracket and tighten the bolt.

Step 5 — Tail / Brake Light Bulb (1157 — Dual Contact)

The tail and brake light share a single dual-filament 1157 bulb in the rear fender.

1. Remove the two Phillips screws holding the rear fender tail light lens cover.
2. Carefully set the lens cover aside.
3. The 1157 bulb is a push-and-twist type. Push in gently and rotate counter-clockwise.
4. Pull the old bulb out.
5. Align the two offset pins on the new 1157 bulb with the socket tabs.
6. Push in and twist clockwise to lock.
7. Clean the inside of the lens cover with microfiber cloth.
8. Reinstall the lens cover and Phillips screws. Torque to 25-35 in-lbs.

Step 6 — License Plate Light Bulb (194 / W5W / T10)

The license plate light is a small wedge bulb mounted under the rear fender.

1. Locate the license plate light housing under the rear fender near the plate bracket.
2. Remove the 5/16" bolt or Phillips screw holding the light housing.
3. The 194 bulb is a wedge-type — pull it straight out of the socket.
4. Insert the new 194 bulb by pushing it straight in.
5. Reinstall the housing and tighten the bolt/screw.

Step 7 — Front Running Light Verification (1157)

Some Softail Standard configurations have separate front running lights.

1. If equipped, the running lights share the 1157 bulb in the front turn signal housings.
2. Follow the same procedure as Step 3 for front turn signals.
3. Verify dual-filament function (running light + turn signal).

Step 8 — Test All Lights

1. Turn the ignition to ON (do not start the engine).
2. Test the low beam headlight.
3. Switch to high beam headlight.
4. Test the left turn signal (front and rear).
5. Test the right turn signal (front and rear).
6. Press the brake lever — verify bright filament illumination.
7. Squeeze rear brake pedal — verify bright filament illumination.
8. Verify the tail light dims appropriately (running light mode).
9. Check the license plate light is illuminated.

Step 9 — LED Upgrade Considerations

If upgrading to LED bulbs:

1. Headlight LED (H4): H4 LEDs must have proper beam pattern to avoid blinding oncoming traffic. Aim the headlight after installation.
2. Turn Signal LEDs: Harley-Davidson CAN bus may interpret low-draw LEDs as burnt-out bulbs, causing hyper-flashing. Install a load equalizer (Harley-Davidson p/n 68194-04) for each turn signal pair.
3. Tail/Brake LED (1157): Most 1157 LED replacements work plug-and-play without resistors.
4. Polarity matters: LED bulbs have positive and negative terminals. If an LED does not light, remove it, rotate 180°, and reinsert.

Step 10 — Headlight Aiming Verification

1. Position the bike 25 feet from a flat wall on level ground.
2. The center of the low beam hotspot should be at or slightly below headlight center height.
3. Adjust using the two vertical adjustment screws on the headlight bucket if needed.
4. Tighten adjustment screws to specification.

Tips & Warnings Table

Common Mistakes to Avoid

Proper Disposal

• Halogen bulbs: Can be disposed of with regular household trash — they do not contain mercury. However, wrap used bulbs in paper to prevent glass breakage.
• LED bulbs: Do not dispose in regular trash. Take to an electronics recycling center or auto parts store that accepts LED bulbs.
• Burnt-out bulbs: Even if non-hazardous, consider taking to an auto parts store — many accept used bulbs for recycling.

Verification Checklist

After completing all replacements, verify each of the following:

• [ ] Headlight low beam illuminates
• [ ] Headlight high beam illuminates
• [ ] Front left turn signal flashes amber
• [ ] Front right turn signal flashes amber
• [ ] Rear left turn signal flashes amber
• [ ] Rear right turn signal flashes amber
• [ ] Tail light illuminates (dim filament)
• [ ] Brake light illuminates brightly (front lever)
• [ ] Brake light illuminates brightly (rear pedal)
• [ ] License plate light is illuminated
• [ ] Headlight beam aim is correct at 25 feet
• [ ] All lens covers are properly seated and sealed
• [ ] All fasteners torqued to specification
• [ ] No tools left on or near the motorcycle

Guide created for the Harley-Davidson Softail Standard FXST with Milwaukee-Eight 107 engine. Always refer to the official Harley-Davidson Service Manual for the latest specifications and torque values.

Parts for this job

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Stock Style Tail Lamp Replacement Lens Clear$7.02Tail Lamp Stock Type Red Plastic Lens$12.80*UPDATE Tail Lamp Lens Stock Clear$12.94*UPDATE Tail Lamp Plastic Clear Lens$12.94Tail Lamp Lens Red with Blue Dot$17.12Tail Lamp Blue Dot Red Plastic Lens$21.44Tail Lamp Lens Stock Red$22.24Mini 12 Volt Bulb For Turn Signal and Indicator$26.15Stock Tail Lamp Clear Lens$29.71Lens and Rim Kit For Stock Tail Lamp$32.51Tail Lamp Lens Stock Style Red$39.32H-4 LED Bulb 6 to 24 Volt$40.67