Alt? Battery?

[Rex]

Searched on windows AND battery and found nothing applicable.

When in my car with motor running (lights on & off, in D & P) and windows up, if I push the window switch as if I'm trying to put a window up, I can hear the motor dip somewhat.

In short I'm wondering if it's just a charateristic of the power window motors, or if the batt/alt may need attention.

Alt - orig as far as I knowBatt - Interstate Mega-tron <2 years old

Any ideas?

[elwesso]

Normal..... Just to verify, when you press the button you hear the motor "click" or quasi engage, and the lights dim a bit?

If thats the case, it does that on EVERY car ive come in contact with..... some more than others!

[Rex]

I guess my question stemmed from the fact that if you try to lock the door and it's alrady locked nothing happens, but if I try to roll up a window that's already up, the engine bogs slightly, seemingly from alt/batt drain??

<I'm sure Q45Tech will know if it's normal>

[elwesso]

Yeah, what your describing is normal..... The window motor doesnt know when its at the top so it keeps going till it stops....

Q45tech will confirm

[DAEDALUS]

Maybe it's the window motor drawing too much current? Doesn't sound normal to me.

[Rex]

They all do it, if they're already up all the way.

[Q451990]

When either Q is running under remote start, the park lights flash on and off. Even that drain changes the idle speed slightly. I'd say the p/w motor drain is normal.

Heath

[elwesso]

It should be just barely detectable..... Thats how it is in mine, at night if you look REAL close you can tell, and you can see the idle go down A TAD and the fan speed go down a little...

My lights go slightly dimmer (just a tiny little bit) when Im sitting at a stoplight right after the car has been started... Id say thats normal too....

[Q45tech]

You measure the battery voltage [while running] .THe regulator spec is 14.1-14.7 volts depending on temp.

At 1300 rpm the maximum capacity of alternator is 34 amperes vs 82 amps at 2,500 rpm.............105 amperes at 5,000 rpm only.

I'll bet it is <20 amperes at warm idle 700 rpm............just enough to run the car electronics [engine/transmission] and maybe the radio and heater fan on low.4 amps for fuel pump, 2 for injectors 2 for spark.