For the 2002 Dodge Ram 3500, both the low-beam and high-beam headlights use a 9004 bulb. The supplied fitment data does not identify a separate projector or non-projector headlight variation, so verify the existing bulb before ordering. If equipped, the fog lights use 896 bulbs.
Several rear-light applications depend on the lamp assembly or production timing. Reverse lights use 1156 bulbs on early models and 3157 bulbs on late models. Brake and tail lights may use either 1157 or red 3157R bulbs, so compare the original bulb. Rear turn signals likewise use either amber 1157A or 3157A. Front turn signals, parking lights, and front side markers use 3157A, while the rear side marker uses 194NA. The center stop light and trunk light use 921. For license-plate lighting, compare the original bulb to determine between 97 and 168.