Battery And Brake Light On Dash Came On - Hyundai Forums : Hyundai Forum
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#1 Old 08-11-2009, 03:06 PM
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FJM122
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Hey everyone, long time reader but have never posted before. I need a little help as to what the problem is that I am having. Last week while I was on vacation I had the battery light and brake light on the dash both come on at the same time. Just as these came on I was driving through some water on the road from a heavy storm that had happened earlier in the day. As I drove through, the lights came on at the same time and I lost power steering as well, after about 15 - 30 seconds both lights went off and everything was normal. It happened again later that day as well, same scenerio, driving through some water, both lights came on, and no power steering. The lights once again went out after a short period, 15 seconds or so. Any one with any ideas as to what might be causing this? I was thinking maybe the alternator is going bad but I have not seen any other issues, lights dimming or things like that.

oh 2004 Santa Fe 2.7L V6 with about 94000 miles.
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#2 Old 08-11-2009, 04:43 PM
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Your issue is nowhere near as serious as you think. When you drove through the water, it got between the serpentine belt and the pulleys, causing the belt to slip and lose momentum. This belt runs the power steering pump, the alternator and many other accessories. When the belt slips, the alternator is not turning as it should and the current drops causing the charging light to come on.

Cars do funky things when they get insufficient voltage which is why you got the brake light.

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#3 Old 08-11-2009, 09:50 PM
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DSHornet
Yup, I concur with LMSF's diagnosis. But serpentine belts tend not to slip nearly as badly as V-belts on older cars when they get wet. Your car is old enough and has enough mileage that the serpentine belt my need changing. Just part of vehicle ownership.

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#4 Old 08-12-2009, 05:04 PM
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FJM122
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ok, thanks for the info from both of you. I guess I'll make some time to have the belt checked/replaced just in case
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#5 Old 08-13-2009, 05:39 AM
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philt123
Wow! My daughter had the exact same problem 2 weeks ago after a day of flooding rain. 63,000 miles on 2004 Santa Fe. Never changed the belt. Can't believe the exact same problem.

Phil
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#6 Old 08-14-2009, 04:39 PM
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FJM122
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QUOTE (santaphil @ Aug 13 2009, 05:39 AM)
Quote:
Wow! My daughter had the exact same problem 2 weeks ago after a day of flooding rain. 63,000 miles on 2004 Santa Fe. Never changed the belt. Can't believe the exact same problem.

Phil
must be that time of year. I am not having any issues with the Santa Fe but still am going to probably have it checked out just in case.
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#7 Old 08-19-2009, 05:52 AM
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philt123
QUOTE (FJM122 @ Aug 14 2009, 03:39 PM)
Quote:
must be that time of year. I am not having any issues with the Santa Fe but still am going to probably have it checked out just in case.

I just changed the serpentine belt anyway. 5 years and 63,000 is a long time not to change that belt.
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#8 Old 09-01-2009, 03:00 PM
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FYI if this happens in dry weather, then you may have to replace the alternator as it's the same warning lights that come on when it goes. But you will also notice the smell similar to burning popcorn when the alternator craps out.

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#9 Old 12-26-2012, 12:03 AM
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Definitely replying late as this is 3+ years old, but I had a problem with my 06 Tucson. I was recently on a road trip and all the sudden I hear my belt squeal and my battery and brake light came on and I lost all power steering. After looking at the problem it turned out my harmonic balancer or crank pulley needed to be replaced. Just thought I would post this for someone who may want to see another option. If it does need to be replaced it should be VERY obvious to the mechanic looking at the car.
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#10 Old 05-01-2013, 08:56 PM
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My 2004 V6 just gave me the same lights. Dry weather. The "battery" and the brakes light same on together, stayed on for maybe five minutes, then went out. then came on for a few minutes until I got where I was going. Half an hour later, it started up with no warning lights. Then they came on together after five minutes and stayed on.

I checked battery voltage when I got home, 11.9 volts with the engine running, way too low. No alternator output. No change with revving the engine, either. Turn the engine off & the voltage recovered to 12.3, no load. So I put it on the charger overnight and drove it today, lights on all the tie. It's back on the charger as I type.

Maybe just alternator brushes?? Any experience with alternator brushes or should I just bite the bullet and buy a new alternator?

Norm
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