2024 Peterbilt 579 Bulb Size Guide

Quick reference

LED vs halogen upgrade considerations

When upgrading your 2024 Peterbilt 579 to LED bulbs, there are a few things to keep in mind. While LED bulbs offer a longer lifespan and brighter light, they can sometimes cause issues with your truck's computer system. This is because LED bulbs draw less power than halogen bulbs, which can make the computer think that a bulb is burnt out. This can trigger a "bulb out" warning on your dash, or in some cases, cause the turn signals to "hyperflash" (blink rapidly). To avoid these issues, you will need to install a CANBUS-compatible LED bulb or an inline resistor. These products are designed to mimic the power draw of a halogen bulb, which will prevent the computer from throwing an error code.

How to replace each bulb

Low Beam Headlight: The low beam headlight is located in the main headlight housing. To replace it, you will need to open the hood and access the back of the headlight assembly. Twist the bulb socket counter-clockwise to remove it, then pull the old bulb out and insert the new one. Be careful not to touch the glass of the new bulb with your bare hands, as this can cause it to burn out prematurely.

High Beam Headlight: The high beam headlight is also located in the main headlight housing. The replacement process is the same as the low beam headlight.

Fog Light: The fog light is located in the lower bumper. To replace it, you will need to access the back of the fog light assembly from underneath the truck. Twist the bulb socket counter-clockwise to remove it, then pull the old bulb out and insert the new one.

Daytime Running Light: The daytime running light is located in the main headlight housing. The replacement process is the same as the low beam headlight.

Front Turn Signal: The front turn signal is located in the main headlight housing. The replacement process is the same as the low beam headlight.

Rear Turn Signal: The rear turn signal is located in the tail light assembly. To replace it, you will need to remove the tail light assembly from the truck. There are two screws that hold the assembly in place. Once the screws are removed, you can pull the assembly out and access the bulbs.

Brake Light: The brake light is located in the tail light assembly. The replacement process is the same as the rear turn signal.

Tail Light: The tail light is located in the tail light assembly. The replacement process is the same as the rear turn signal.

Reverse Light: The reverse light is located in the tail light assembly. The replacement process is the same as the rear turn signal.

License Plate: The license plate light is located above the license plate. To replace it, you will need to remove the two screws that hold the light in place. Once the screws are removed, you can pull the light out and access the bulb.

Side Marker: The side marker light is located on the side of the truck. To replace it, you will need to remove the two screws that hold the light in place. Once the screws are removed, you can pull the light out and access the bulb.

Dome/Map Light: The dome/map light is located in the headliner. To replace it, you will need to pry the lens off with a small flathead screwdriver. Once the lens is removed, you can access the bulb.

Common lighting issues for this generation

The 2024 Peterbilt 579 is a new model, so there are not yet any common lighting issues to report. However, as with any vehicle, it is important to check your lights regularly to make sure they are all in working order. If you do experience any problems with your lights, it is best to have them checked out by a qualified mechanic.

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