What Causes One Headlight to Be On While the Other Is Off?

1 Answers
SanKevin
07/30/25 1:20am
The reasons for one headlight being on while the other is off are as follows: 1. Car headlights are divided into high beam and low beam. The switches for the two bulbs of either the high beam or low beam are connected together. If they are on, both will be on; if not, both will be off. If only one side is on, it means the bulb on the other side is either burnt out or has poor contact. Testing this is simple—just swap the bulbs on both sides to identify the issue. 2. If the bulb is damaged, it needs to be replaced. When selecting a bulb, be sure to choose the correct model. Car headlight sockets are produced according to uniform standards, so as long as the headlight model matches, it can be installed.
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