Headlight wont turn on

Alex Cook

Asked by May 15, 2015 at 01:13 AM about the 2006 Ford Mustang GT Premium

Question type: Maintenance & Repair

both headlights turn on if the keys are in the ignition but the vehicle is off, once i start the
engine one of the headlights go out. also both of my brights wont work with the car on

3 Answers


Start with 2 new bulbs and while it is still apart use a test light to verify power and grounds. what wires do what, hi lo and ground. Is it ok with 2 new ones or is there a problem before plugging in, during the tests.

Best Answer
Alex Cook

Both randomly started working fine the last time I started it but I'll run the tests anyways. Thank you for the help


Filaments that break could still make intermittent contact based on vibration, jarring or temp, so that can be a simple answer.

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