I think I said it all in the title. Powering my windows up or down dims my headlights, same with a/c, sunroof, and stereo. Btw this is a 99 prelude.

Is this normal?

 

not normal, check your fuses

 

mine does the same thing but its when i got my UR pullies put on.

 

get a multimeter and check the output of your alternator. its should be about 13.7 to 14.0 volts

 

Check out the voltage regulator as well, this distributes the right amount of power when devices are switched on.

 

could also mean your battery is on it's way out.

 

what about the lights dimming when you your car is off when you try to roll up the windows and or sun roof?
usually when i park i use this order turn off engine> sunroof> windows> lights.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bboyprelude &raquo;</TD></TR><TR><TD CLASS="quote">what about the lights dimming when you your car is off when you try to roll up the windows and or sun roof?
usually when i park i use this order turn off engine&gt; sunroof&gt; windows&gt; lights.</TD></TR></TABLE>

they'll dim, because you're pulling extra power from the battery to roll up your windows and close the sunroof. Batteries have to product electricity via a chemical reaction. When you start to pull more amps (running the motors to roll the windows up, etc) the volts drop. The volts dropping are what's making your lights dim. As soon as you quit rolling up your window, the amp draw returns to the normal level, which inturn brings the volts back up so your lights are brighter again

 

you would be better off reversing that order. your putting undue stress on your batt. which will shorten the life.