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RAM 2500 2012 Bulb Size
Bulb size chart
Headlight Bulb High Beam - 9005
Headlight Bulb High Beam and Low Beam - H13
Headlight Bulb Low Beam - H11
Back Up Reverse Light Bulb - 921
Brake Light Bulb - 3157R
Center High Mount Stop Light Bulb - 921
License Plate Light Bulb - 194, 7441
Parking Light Bulb(with 2 headlights) - 3157
Parking Light Bulb(with 4 headlights) - 3157A
Side Marker Light Bulb Front - 3157A
Tail Light Bulb - 3157R
Turn Signal Light Bulb Front(with 2 headlights) - 3157
Turn Signal Light Bulb Front(with 4 headlights) - 3157A
Turn Signal Light Bulb Rear - 3157
Ash Tray Light Bulb - 37
Dome Light Bulb - 578
Map Light Bulb - 212-2
Trunk or Cargo Area Light - 921
9005 Bulbs
Used for: Headlight Bulb High Beam
H13 Bulbs
Used for: Headlight Bulb High Beam and Low Beam
H11 Bulbs
Used for: Headlight Bulb Low Beam
921 Bulbs
Used for: Back Up Reverse Light Bulb, Center High Mount Stop Light Bulb, Trunk or Cargo Area Light
3157R Bulbs
Used for: Brake Light Bulb, Tail Light Bulb
194 Bulbs
Used for: License Plate Light Bulb
7441 Bulbs
Used for: License Plate Light Bulb
3157 Bulbs
Used for: Parking Light Bulb(with 2 headlights), Turn Signal Light Bulb Front(with 2 headlights), Turn Signal Light Bulb Rear
3157A Bulbs
Used for: Parking Light Bulb(with 4 headlights), Side Marker Light Bulb Front, Turn Signal Light Bulb Front(with 4 headlights)
37 Bulbs
Used for: Ash Tray Light Bulb
578 Bulbs
Used for: Dome Light Bulb
212-2 Bulbs
Used for: Map Light Bulb
Looking for bulb sizes for your 2012 RAM 2500? This page is organized by lighting position so you can quickly verify the correct bulb for each exterior and interior lamp before you buy. That makes it easier to match the right replacement to the right socket, whether you are changing a headlight, tail light, or small cabin bulb.
The 2012 RAM 2500 can use different bulb setups depending on trim, body style, and lighting package. Use the bulb chart on this page to compare each location, including high beam, low beam, reverse light, license plate light, dome light, and more. Checking by position helps reduce mistakes when replacing bulbs on this truck.
Fitment can vary on the 2012 RAM 2500, especially if the truck has different headlight layouts or market-specific equipment. Some positions use halogen bulbs, while others may have been converted to LED by a previous owner or through an aftermarket kit. If your truck has been modified, the bulb listed for the original setup may not match what is installed now. For the best result, inspect the bulb already in the vehicle before ordering, and confirm the base style and connector shape. That is especially important for headlight conversions, because aftermarket LED or HID kits can change the required bulb type and may need additional hardware to fit correctly.
FAQ
What are the headlight bulb sizes for a 2012 RAM 2500?
For this model year, the chart lists 9005 for the high beam bulb and H11 for the low beam bulb. Some configurations may use a combined H13 setup instead, so it is important to match the bulb type to the exact headlight assembly on your truck.
Does the 2012 RAM 2500 use the same bulb for the reverse light and center high mount stop light?
Yes, both the back up reverse light and the center high mount stop light are listed as 921 on this page. Always confirm the socket and lens location before replacing them.
What bulb fits the license plate light on a 2012 RAM 2500?
The license plate light bulb is listed as 194 or 7441. Either may appear depending on the exact lamp design and market variation.
What is the dome light bulb size for the 2012 RAM 2500?
The dome light bulb is listed as 578. This is the interior overhead light bulb used in many RAM truck configurations.
What bulb is used for the map light?
The map light bulb is listed as 212-2. Check the overhead console or mirror area carefully, since some trucks may have different interior lighting packages.
What bulb fits the ash tray light, if equipped?
The ash tray light bulb is listed as 37. This is an optional bulb position, so not every 2012 RAM 2500 will have it.
What are the front turn signal and parking light bulb sizes?
For trucks with 4 headlights, the front turn signal bulb and parking light bulb are listed as 3157A. For trucks with 2 headlights, both the front turn signal and parking light bulbs are listed as 3157.
What bulb does the side marker light use?
The front side marker light bulb is listed as 3157A. This helps keep the front lamp assembly consistent with the other front signal and parking light positions on certain setups.
What bulb size is used for the tail light and brake light?
Both the brake light bulb and tail light bulb are listed as 3157R. That makes it easier to replace both rear functions with the correct bulb type.
What bulb fits the rear turn signal on a 2012 RAM 2500?
The rear turn signal light bulb is listed as 3157. This is separate from the 3157R used for brake and tail light functions.
Can I switch the 2012 RAM 2500 bulbs to LED replacements?
Yes, many owners upgrade to LED bulbs, but the replacement must match the correct base and fit the housing. LED bulbs can also change brightness, beam pattern, and warning behavior, so it is best to compare the original bulb type before buying.
Why does the bulb size sometimes differ between similar RAM 2500 trucks?
Trim level, lighting package, body style, and market can all affect bulb fitment. A truck with one headlight layout may use H11 and 9005, while another setup may use H13 for combined high and low beam operation.
What should I check before ordering bulbs for my 2012 RAM 2500?
Check the installed bulb, the socket shape, and the lamp position on the truck. Matching the bulb to the exact location is the safest way to avoid ordering the wrong part, especially if the truck has been modified or has non-stock lighting.