My left signal light is not working.
If only the left signal is not working, suspect a faulty bulb. If a replacement bulb does not fix the problem then the circuit is lacking either power or ground. In this case, electrical diagnosis will need to be performed. However, I suggest you try having the bulb replaced first. A professional, such as one from YourMechanic, can inspect your turn signals to make sure that the proper repairs are completed.
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