Both headlight bulbs blow together?

Headlight bulbs are shorting out,this is basically the reason why this bulbs blows out.When non branded bulbs are used ,they don't last long,but here the issue is different,both bulbs blowing out together,same time.
In case the voltage supplied to bulb needs to be inspected.Basically car charging system is battery and battery is controlled /charged by Alternator.Alternator is the parts which supplier regulates the voltage to cars charging system.
In this cases cars alternator and voltage supplying regulator needs to be tested.
The voltage should not go higher than 14.5 volts, if the voltage continues to rise beyond the max limit the voltage regulator has failed and needs to be replaced

For testing alternator/voltage regulator:---

How to test cars Alternator?

Click the link below for details:---

http://howtobyme.blogspot.com/2011/11/how-to-test-cars-alternator.html

If the alternator is tested faulty,then replace the alternator,then see if headlights are blowing out,if yes then most possibly is short in wiring's from headlight bulbs to headlight switch OR its faulty head light switch.

Getting this possible components inspected and tested will help.

Thanks.

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For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

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Car headlight bulbs don't last long?

http://howtobyme.blogspot.com/2011/11/car-headlight-bulbs-dont-last-long.html

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How to replace Interior Lights on car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-interior-lights-on-car.html

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Car lights not working, even after replacing the bulb/lamp?

Click this link below:--

http://schematicsdiagram.blogspot.com/2011/06/car-lights-not-working-even-after.html

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How to replace head lights on car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-head-lights-on-car.html

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How to replace Parking, turn, and Brake Lights on car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html

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The car will not start?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-start.html

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Car will not crank?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-crank.html

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Car has no spark?

http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html

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How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html

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How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

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How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

How to replace starter in car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html

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car will turn over but will not start?

http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html

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Car wont start?

http://howtobyme.blogspot.com/2011/10/car-wont-start.html

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The Brake Indicator Light Stays On dash of car?

http://schematicsdiagram.blogspot.com/2011/06/brake-indicator-light-stays-on-dash-of.html

The ABS and Traction Control Lights stays ON dash of car?

http://schematicsdiagram.blogspot.com/2011/06/abs-and-traction-control-lights-stays.html

Check Engine Light On car?

http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html

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