Alright, I see another post in this group from years ago that says this is normal. Anyway, I have a 2000 Sienna and just recently replaced the battery. All appeared well, but at night, I noticed that the dome lights and Instrument panel had a slight flicker. Kind of like something was turning on and off and drawing the voltage down (however a digital voltmeter shows the variation to only be .3 volts or so worse case). This only happens when the car is running and really is only visible at night. Looking at the battery terminals they were pretty cruddy from acid so I replaced them. That seemed to make the instrument panel flicker almost disappear, but you still see it in the dome lights. Battery is being charged fine if I check the specific gravity. The only thing I notice is after starting the car, the voltage is in the 13.8 range, but after driving a short time, it works its way up to about 14.4. So far as I can see everything seems to be working as expected. Its just that I have never seen a constant flicker like this before. Kind of makes me wonder if there is a slight AC component in there.
Anyway, am I just chasing my tail and should I just let it go or is there something going on here?
Thanks, Ken