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This is the most common complaint and usually has a simple solution. On the 2018 Ram, the most likely culprit is a burned-out halogen bulb. Halogen bulbs have a typical lifespan of 500 to 1,000 hours, and failure is expected over time. However, if you have recently replaced bulbs and one side is still dim, check the wiring connector for corrosion or melting. The 2018 Ram is known to have some issues with headlight harness connectors overheating, especially on trucks that tow heavy trailers or operate in hot climates. Replacing the connector pigtail is an inexpensive fix.