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Old 03-23-2010, 01:17 AM   #1 (permalink)
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cyper2002
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Hello, I noticed for a while now that sometimes when I use the brakes in my 2007 santa fe the headlights dim momentarily. It may just happen shortly after taking the car out, as thats when i usually notice it. Anyone have any guesses as to what could cause this? Could it be an alternator problem?
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Old 03-23-2010, 02:34 PM   #2 (permalink)
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What you describe is pretty common when several high electrical loads kick in at once. I know on my 2008, I can get a quick dim when the ABS module runs it's self test the first time you hit ~20mph after startup, which the heater blasting, rear defroster on, etc..

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Old 03-23-2010, 03:28 PM   #3 (permalink)
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thanks for the reply. Yeah it happens really quickly like you describe, its probably just normal then. I have generally had the heat and defrosters running when i notice it too.
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Old 03-25-2010, 09:38 AM   #4 (permalink)
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If you don't like your lights dimming, upgrade your alternator to a higher power one, just too much load on the system at once.

I remember when i was younger with a stereo system, headlights would dim when the music was loud Same idea, bigger battery, bigger alternator.

Not really an issue in a stock vehicle thoe
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Old 03-25-2010, 10:29 AM   #5 (permalink)
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Yep, a higher capacity battery and cabling with lots-o-copper can help with this issue too.

Joel
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Old 03-25-2010, 04:33 PM   #6 (permalink)
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QUOTE (fuzzai @ Mar 25 2010, 09:38 AM)
Quote:
If you don't like your lights dimming, upgrade your alternator to a higher power one, just too much load on the system at once.

I remember when i was younger with a stereo system, headlights would dim when the music was loud Same idea, bigger battery, bigger alternator.

Not really an issue in a stock vehicle thoe

QUOTE (PoMansAWD @ Mar 25 2010, 10:29 AM)
Quote:
Yep, a higher capacity battery and cabling with lots-o-copper can help with this issue too.

Joel

Thanks guys! I don't need to spend the money upgrading anything though, it isn't really an issue for me as long as it's normal. I was just making sure it wasn't abnormal or a sign of something going bad, ready to break, etc. Thanks for the help though!
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