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headlights keep going out V70-XC70

posted by  Jroo on  Thu Jul 19 02:06 CST 2007
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last visit: Tue Mar 20 03:31 CST 2007
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This is the second set of bulbs I have placed on the left and right low beam. Each time as I drive or pull in the work garage i notice they have gone out. The fuses are not blowing and no idiot lights on my dash, but the bulb looks black and the filament inside is broken like the light just went out. I have used the same sylvania h7 st bulbs everytime and the set before these lasted close to 2 years. What would cause me to go through bulbs like this all of a sudden. I put a set in yesterday morning and that set went this morning. Any ideas what to check?







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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    KSG is correct on all counts, except the voltage should be around 14.7 from the alternator. Sounds like a voltage regulator problem and you are putting out about 16-17V or more.

    Klaus
    --
    Please answer your responses. We need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Klaus, thanks - indeed as shown in graph in this link the charging voltage could be around 14.7 but should decrease in warm weather:

      http://landiss.com/battery.htm



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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    Check or have checked the charging voltage from your alternator and also the main connections among alternator, starter and battery for corrosion or looseness. It is possible your system is overcharging. This can occur due to a bad voltage regulator and/or loose connections, including bad ground connections. You should with the engine running read a voltage around 14 volts at the battery terminals. If there are many electrical accessories on you may need to rev the engine up to about 2000 rpm to get a correct reading. If the voltage is closer to 15 volts than 14 that would indicate overcharging. Another indication would be if your battery is getting very hot or the elecrtrolyte fluid is boiling out, especially after a long drive.



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