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Headlights dim when braking?

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Old Sep 4, 2008 | 07:15 PM
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Default Headlights dim when braking?
2000 Coupe Automatic Transmission
Cruising at night at speed above 45 mph when I press the brake the headlights dim for a moment. Any ideas?
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Old Sep 4, 2008 | 07:18 PM
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2000 M6 and mine does the same thing. I would say it's normal.
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Old Sep 4, 2008 | 07:39 PM
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My 01 did that for a while and I got a lot of suggestions about it. None seemed to work, finally one morning it wouldn't start. Dead Battery. New battery and dimming problem disappeared.
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Old Sep 4, 2008 | 08:28 PM
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Originally Posted by 1badf350
2000 Coupe Automatic Transmission
Cruising at night at speed above 45 mph when I press the brake the headlights dim for a moment. Any ideas?
Is it a very minor change in lighting? Or do they get really dim? I have a new battery and I get a very minor change.
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Old Sep 4, 2008 | 09:24 PM
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Originally Posted by HT1663WB
Is it a very minor change in lighting? Or do they get really dim? I have a new battery and I get a very minor change.
It's minor...but annoying.
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Old Sep 4, 2008 | 09:48 PM
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If you're paying attention, they'll probably do the same thing when you push the power window switch.
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Old Sep 4, 2008 | 11:03 PM
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Your battery is probably getting weak or the connections to it are getting corroded,
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Old Sep 4, 2008 | 11:39 PM
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Originally Posted by dgrant3830
Your battery is probably getting weak or the connections to it are getting corroded,
Weak battery, huh? ......while the car is running?
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Old Sep 4, 2008 | 11:50 PM
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Default Dimming Lights
Hi,
I agree with dgrant, lights dimming under increased draw is a sure sign that either your connections are dirty or loose, or your battery is getting weak and will soon leave you stranded. A car with good connections and a proper charging system and a strong battery will not show a dimming of lights when more load is applied.
Good Luck
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Old Sep 5, 2008 | 12:28 AM
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I had the same problem and it turned out to be the battery that had one bad cell. I believe that they have a total of 8. Once one goes bad the rest will follow. These cars have an elaborate electical system and require a good battery. Mine went bad because someone put a small cheap battery in a high dollar car. Do yourself a favor and spring for an optima and call it done. Solved my problems.
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Old Sep 5, 2008 | 02:03 AM
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it is not the battery, it is a relay or something like that, anytime a load placed on system lights dimm, chevy knows about it but can't seem to fix it according to people who have taken car in...more of annoying, not problem that will cause car to fail...repeat, it is not the battery in 99% of cases
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