2007 Santa Fe Blows Headlight Bulbs - Hyundai Forums : Hyundai Forum
 
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#1 Old 04-02-2011, 12:20 AM
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gbmike
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Hi all, the low beams on our 2007 Santa Fe both started failing about 6 months ago. After market bulbs from Advanced Auto and others only last about a week. I replaced the last burned out bulb with an expensive replacement from the Hyundai parts counter - it is obviously thicker glass and even somewhat larger and $30 instead of $7.

So the other inexpensive bulb has burned out again, and I'm wondering
  • If anyone has also experience this?
  • Is there a higher output bulb (non HID) that would be a worthwhile and proven replacement?
  • Is there a less expensive source of the Hyundai replacement bulb?


btw, when they blow, I can see that the filaments are broken, there's no discoloration or cracks in the glass.

Thanks!
Mike
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#2 Old 04-02-2011, 01:07 AM
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QUOTE (GBMike @ Apr 1 2011, 10:20 PM) Given that you've already had replacements installed from several different brands, it's time to focus on what's abusing them under the hood. Given that you don't mention any discoloration or other abnormality on the surface of the bulb, it sounds as though you are handling them properly during installation (NO fingers, right)? Material left behind by your fingers will create local hot spots on the bulb and will usually take a halogen lamp out very quickly. Actually, contamination from any source can be a problem. I assume that the seals on the housings themselves are keeping the elements out? No signs of fogging or water getting in there from your oh-so-salty Florida air? One of those two is usually the killer.


Another killer of halogen lamps is 'short cycling'. Did your lamps seem to be behaving normally in use (never any flickering while in use) before they stopped working? Was there ANY sign of corrosion on either the socket or the bulb when you removed the bad ones?

Alternately, and far more difficult to notice, is the reverse -- a situation where the headlights are being (barely) flickered [b]on by an intermittent connection through the multifunction switch or a defective headlight relay. Those can be a total bugger to spot since in the daytime, you'd normally never notice them flickering on from the driver's seat. Fortunately, that's really quite rare. Both conditions will take out the older sealed beam lamps as well.

Check all ground connections carefully. Then there's the old "check the voltage regulator output". Transients aren't usually an issue. It's a sustained overvoltage we're looking for, but that kind of problem will take out the battery and other incandescent lamps in short order, and the headlamps would be the least of your worries.
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#3 Old 04-02-2011, 09:26 AM
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You should be able to buy the dealer-supplied bulbs (if they are not burning out) elsewhere for a bit less. They're just GE or whatever... take one with you.
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#4 Old 04-02-2011, 12:26 PM
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Most of what I see across our counter is currently PHILLIPS..

Dont waste your money on gimmick bulbs for the most part.. Wife Sedona popped 1 (H7) last year, I used 1 of our bulbs.. going along just fine.

Another good bulb to look for be OSRAM.. German manufacture.. I use them in the H4 line in 100/80 in my daily drive with HELLA H4 housings..

Biggest thing is to not touch the bulb' glass, make sure they set proper into the lamp housing so as to not have the bulb rattle/get jarred with road vibrations,, I see bulbs installed upside down and crooked all the time, light dont project out proper.. make sure the cap is installed proper, and the o-ring is on the cap too to seal out atmosphere during use.

<--- please fill in the 'location' and 'what you drive' boxes on your personal profile page.
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#5 Old 04-03-2011, 01:37 AM
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gbmike
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Thanks for the replies!

I've been careful not to touch the bulbs and there does not appear to be any contamination inside the light housing - lenses are nice and clear. The idea of short cycling is interesting... The light switch is always left in the ON position, so I'm wondering if any voltage transients while starting the engine are the culprit here. (But then why did the original bulbs last 4 years and the replacements are so susceptible to problems?) I'll put a volt meter on the connector and see if anything obvious if happening.

Mike

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#6 Old 04-03-2011, 12:06 PM
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QUOTE (GBMike @ Apr 2 2011, 11:37 PM)
Quote:
... so I'm wondering if any voltage transients while starting the engine are the culprit here.
Unlikely as the headlights aren't normally illuminated during starting, are they? Headlamps usually handle transients fairly well. As voltage goes, they only usually complain about sustained above-normal voltage, and you usually find yourself with a whole lot of other problems as well (bad for the battery and all of the other incandescent lamps apart from those in the dash). I've also heard a lot of anecdotal evidence that one brand of bulb in particular (with, ahem, a blue coating on the glass) tends to burn out faster due to the heat created, but we'll leave that for another forum.
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