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Headlights Tail and Brake Lights
Ford E-250 Van
Ford F-150

What could be wrong if your daytime running lights and your back up lights do not work?


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Wiki User
2006-11-05 10:05:50
2006-11-05 10:05:50

The first thing I'd do is check the fuse. If the fuse is good the you might have a short in a wire somewhere.

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Check the daytime running lights module. This has failed with other manufactures resulting in lights that stay on, or are very dim while the vehicle is running.

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If the headlight that runs through the modulator first is out then the daytime running lights won't work. Change the bulb and the daytime lights should then work.

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Answering my own question here, it's what I thought it was. One of my high beams was out, so my high beam indicator was flashing when my headlights were not turned on. As for the daytime running lights, they came back on when I changed the bulb.

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As a guess both low beams are burnt out The daytime running and high beams are the same light filament. Or the fuse or the relay for the low beams.

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On my 98 sunfire, the tail lights and marker lights only work if you turn on the headlights. If only the daytime lights are on, the Pontiac on the trunk is illuminated but no other lights at the rear until brakes or turn signals are activated. This is common with a lot of vehicles out there. Daytime running lights are not necessarily the same candle power as the headlights. I can tell a big difference in mine.


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