Dimming head lights

I was wondering if anyone had any ideas about what could cause my headlight to dim when I press some buttons in my new/used 2006 Caravan. Here's what happens. I have the van running and and press the window to bring it up but, it's already up. The reason I was trying to put the windows up was I noticed the lights going dim as the van was running by itself. Every once in awhile I would see the headlights go dim for a second and then back to normal. So, that's why I was trying the window buttons to see if it did the same kind on voltage drop. So, any ideas of what part might be causing this.

Thanks in advance

I would say your dimming lights are just a result of voltage drop. That happens whenever you use the power locks or windows in a vehicle (I've done it many times). What would be of greater concern - to me - is if the system while running didn't adjust rather quickly. The alternator should balance the circuit.

What I was wondering is how many folks have their lights go out when slowing down... say to stop at a light or sign. My 2005 Dodge Caravan lights don't just dim but go all the way out for a second. I'm concerned if it will get worse. Dealer can't duplicate, although I'm not sure how they will if they keep checking during the middle of a sunny day...

Bob,the lights on my 2005 Dodge Caravan just started doing the same thing. Did you figure this one out?

Bob wrote:

I would say your dimming lights are just a result of voltage drop. That happens whenever you use the power locks or windows in a vehicle (I've done it many times). What would be of greater concern - to me - is if the system while running didn't adjust rather quickly. The alternator should balance the circuit.
What I was wondering is how many folks have their lights go out when slowing down... say to stop at a light or sign. My 2005 Dodge Caravan lights don't just dim but go all the way out for a second. I'm concerned if it will get worse. Dealer can't duplicate, although I'm not sure how they will if they keep checking during the middle of a sunny day...