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The 2018 Ram2500 comes with reflector headlights that utilize 9005 bulbs for both the low beam and high beam functions. To replace the reverse light bulb in this truck model, owners can follow these steps: Open the truck's rear door and use a T20 torx driver to detach the reverse light assembly. Remove the two screws positioned at the top and bottom of the lamp, then pull the assembly away from the truck, freeing the clips on the outer edge. Disconnect and twist the bottom plug to reach the reverse light bulb. Install the new bulb by turning it clockwise, ensuring that the gasket ring around it is securely and correctly positioned.
The 2018 Ram 2500 uses a 921 sized bulb for the reverse light.