Headlights dim and bright. Why?

[cbrcrx]

Anybody know what would cause my headlights to get dim and bright? I only notice it when I am driving, not sitting still. I can't see any pattern or reason. It doesn't change with bumps, a/c or any other electrical device. The battery cables are clean and tight. Any ideas?

 

[SuperProtege5]

check your connection to the headlights themselves. it could be one of them has wiggled loose.

 

[mx-p5]

maybe have the alternator checked?

Callie's foglights do this, but only when teh stereo is crank'd

Headlights don't as they are HID's

 

[Purrfectangel]

If you haven't got a reasonably new battery it may be dying. Happened to me. The other time it happened the black bulb socket was rusted and loose so I bought a new one, no problems since.

 

[cbrcrx]

My battery and alternator are strong. Also, it is all of the lights, not just one. I can't figure it out.

 

[MSP2k3]

my MSP does this a little bit also, has ever since i have bought it. Only really does it at interstate speeds and if i have the AC on. They dim ever so slightly then go back to normal. Never have figured it out.

 

[v02maxed]

Mine does the same thing. The lights go dim for 1/2 a second, then back to normal. Something must be drawing current while cruising because if I use the power windows the same thing happens, or if I close the power sunroof they dim for a second. I know if you have the vent on the windshield, even though the a/c button isn't on, I think it really is and this could be part of it, when the compressor kicks on and off. Other than that I can't figure it out either.

 

[bucksatan]

If it is only one bulb maybe that bulb is on the way out?

The odd thing is that it is only one bulb, if it were both bulbs I would say something is draining, like power windows, or the AC is kicking on, as everyone else has suggestd. But only one bulb, that is just odd.