Classic Mustang Headlight Switch Install

Your Classic Mustang's headlights are vital for safety on the road, so it's important to make sure the electrical connections are working properly. The headlight switch in particular carries a lot of current, especially on modified Mustangs with halogen headlights. Over time, the switch wires can corrode and age, causing your headlights to flicker or cycle on and off to prevent the switch from overheating. This requires immediate replacement. The good news is that swapping out your 1965-1968 Mustang's headlight switch for an aftermarket replacement is a cheap and easy repair.

Check out our step-by-step instructions below for a comprehensive guide on how to install a headlight switch on your classic Mustang. With a few simple tools and less than an hour, you'll be back on the road with a functional headlight switch.

Tools Needed:

• Flat Head Screwdriver

How to Install a Headlight Switch on a Classic Mustang

For this install, we chose a direct-fit replacement Classic Mustang headlight switch that fits 1965-1968 Mustangs. Before you begin, make sure the part you have is compatible with your Mustang's year and model.

Step 1: Locate Headlight Switch Spacer

Grab your new switch and locate where the wiring harness attaches to the front of the switch. The spacer to the right may be integrated, but it might be a separate piece. Make sure you know where each section of the switch is located.

The back side of the switch has a small button, which is used to release the knob and shaft. Make sure the switch is connected to the shaft.

Step 2: Disconnect Switch Power

Remove the negative terminal from your Mustang's battery. Then, turn the stock headlight switch in your Mustang all the way counterclockwise.

Step 3: Remove Stock Switch Knob and Shaft

Reach up under the dash and press the small button underneath the stock switch. Pull the Mustang headlight switch knob and shaft straight out.

Step 4: Disconnect Retainer and Wires

Use a large, flathead screwdriver to unscrew the Mustang headlight switch retainer. This will release the switch. Disconnect and remove the wires from the switch.

Step 5: Reconnect Wires to New Switch

Take the new switch and reconnect the wires in the same locations as the stock switch. Check the electrical connections by reconnecting the battery, turning the switch to the on position, and disconnecting the battery again.

Step 6: Reinstall New Headlight Switch

With the wires connected, reassemble the new switch in reverse order. Install the Mustang headlight switch bezel and switch retainer, then re-tighten each component with a screwdriver.

Step 7: Secure and Test New Headlight Switch

Push the switch knob and shaft into the factory port until it clicks. Test it to be sure it is seated fully, then reconnect the battery and test the switch functionality.

Upgrade the Rest of Your Mustang's Lighting

Installing a new headlight switch on your Classic Mustang is a simple way to stay safer on the road. An aftermarket switch can help ensure a secure electrical connection for your headlights, allowing you to have confidence in your Mustang's headlight functionality when driving at night.

If you're looking for more ways to upgrade your classic Mustang's lighting, we offer a wide variety of options. From aftermarket headlights to taillights to wiring, check out the button below to shop our selection of Classic Mustang lighting parts.