Chevrolet Silverado 3500HD 2018 Bulb Size
Bulb size chart
The 2018 Chevrolet Silverado 3500HD uses different bulb sizes depending on the lighting position, so this page is designed to help you verify the correct fit before you buy. Whether you are replacing a headlight, a brake light, or a small courtesy bulb, matching the bulb to the exact location is the easiest way to avoid installation problems.
Use the bulb chart for the 2018 Silverado 3500HD to identify the right bulb by function, such as high beam, low beam, front turn signal, rear turn signal, license plate light, or reverse light. This is especially helpful on a heavy-duty truck like the Silverado 3500HD, where trim level, body style, and lighting package can affect the final bulb setup.
For best results, compare the bulb listed for your lighting position with the bulb already installed in the truck before ordering, especially if your Silverado 3500HD has been modified or converted to aftermarket lighting. Some positions may use halogen bulbs from the factory, while others may have LED replacements or LED-style upgrades installed later, which can change fitment expectations even if the socket looks similar. Trim and package differences can also matter, so it is smart to confirm the installed bulb, the connector style, and the housing type before purchase. If you are switching to aftermarket LEDs, make sure the replacement is compatible with the original socket and that the beam pattern, polarity, and load requirements are appropriate for your setup.
FAQ
What bulb does the 2018 Chevrolet Silverado 3500HD use for the low beam headlight?
The low beam headlight bulb listed for the 2018 Chevrolet Silverado 3500HD is H11.
What bulb is used for the high beam headlight on this truck?
The high beam headlight bulb listed for the 2018 Chevrolet Silverado 3500HD is 9005.
What is the fog light bulb size for the 2018 Silverado 3500HD?
The front fog light bulb listed for this model is 5202 LED.
What bulb fits the front turn signal on a 2018 Chevrolet Silverado 3500HD?
The front turn signal light bulb listed is 7443A.
What bulb size is used for the rear turn signal?
The rear turn signal light bulb listed for the 2018 Silverado 3500HD is 7444NA.
What bulb is used for the brake light and tail light?
The brake light bulb listed is 7444, and the tail light bulb listed is also 7444.
What bulb size is used for the reverse light?
The back up reverse light bulb listed for this truck is 921.
What bulb fits the license plate light?
The license plate light bulb listed for the 2018 Chevrolet Silverado 3500HD is 2825.
What bulb is used for the center high mount stop light?
The center high mount stop light bulb listed is 921.
Are the parking light and side marker bulbs the same on this truck?
The parking light bulb listed is 7443, while the front side marker bulb is 7443A and the rear side marker bulb is 7444NA. They are not all the same, so it is important to match the bulb to the exact position.
Does the 2018 Silverado 3500HD use the same bulb in every trim?
Not always. Trim level, body style, and lighting package can change the bulb setup, so it is best to verify the bulb by position on your specific truck before ordering.
Can I replace halogen bulbs with LED bulbs on this model?
Yes, in many cases owners upgrade to LED bulbs, but the replacement must fit the socket and work correctly with the housing. Check for compatibility, beam pattern, and any load or polarity issues before installing aftermarket LEDs.
What should I check before buying replacement bulbs for my Silverado 3500HD?
Check the installed bulb, the lighting position, the socket type, and whether the truck has factory halogen or aftermarket LED lighting. Verifying these details first helps prevent buying the wrong bulb.
What bulb is used for the vanity mirror light?
The vanity mirror light bulb listed for this vehicle is 6612F.