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Old 03-26-2007, 09:56 PM   #1 (permalink)
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lifeguard0321
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My 2006 Sonata GLS headlights dim along with the entire lighting electrical system when my car slows down past 1500 RPM. Does anybody know why??? I had the car worked on 2 weeks after i got it because of this and they replaced a timing chain thinking this was the problem, but it wasnt.
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Old 03-26-2007, 10:01 PM   #2 (permalink)
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An Electrical Short. Possible nightmare situation.

Or perhaps just a bad Alternator?
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Old 03-26-2007, 10:47 PM   #3 (permalink)
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They ... replaced ... the ... timing ... chain for an electrical problem?!? I hope they didn't change you for the work (no pun intended.)

What's next, replace the muffler b/c the horn don't work?

Bad alternator. Wait a minute ... are you SURE they replaced your timing chain and not your serpentine belt? Even that's a stretch (pun intended.)

Finding a short's NBD. Find another Sonata and use an ammeter in place of each fuse to measure and compare the draw/change, one circuit at a time. No doubt there's one that's WAY different. The drain lieth within that circuit.
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Old 03-26-2007, 10:54 PM   #4 (permalink)
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I think those people pulled your leg, lifeguard. They didn't do $hit with the timing chain (that's a LOT of work!)... Or maybe they were talking SPANISH and you misunderstood them?
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Old 03-27-2007, 07:09 AM   #5 (permalink)
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Alternator
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Old 03-27-2007, 09:15 AM   #6 (permalink)
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Lifeguard...

Just curious, do your lights dim and STAY DIMMED below 1500 rpm? The reason I ask is that I experience somthing similar in that when I remove my foot from the accelerator, and am slowing down (I haven't noted exactly what RPM this happens at), I sometimes notice my lights dim for a fraction of a second, then kick back up to normal intensity. It's just a short dim, less than a second.

Thanks...
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Old 03-27-2007, 09:45 AM   #7 (permalink)
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I bet your battery is starting to go bad. Have had those symptoms on other cars and new battery did the trick.
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Old 03-27-2007, 09:53 AM   #8 (permalink)
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Put car in neutral and rev engine to keep lites bright when slowing down....

Just kidding...sounds like a short.
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Old 03-27-2007, 10:15 AM   #9 (permalink)
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To me it sounds like a bad battery or analternator that doesn't charge as it should or both. Have it tested be an electrical shop or the dealer.
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Old 03-27-2007, 10:24 AM   #10 (permalink)
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Definately alternator, use a multimetre on the battery terminals to check the resistance and the fluctuations, also open all doors and open and close windows at stationary with car running if the lights almost turn off or windows are slow at open or close then it is definately the alternator...
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