Power Windows Question
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Lead Driver
Joined: Aug 2006
Posts: 8,094
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From: Brentwood, TN
Power Windows Question
When raising a power window, what happens when the window reaches the top of the opening? These "universal" actuators have no fancy limit switch circuitry, so what does the motor do when it can't push the window up any further?
Postmaster
Joined: Aug 2003
Posts: 3,222
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From: Houston
I don't know how, but mine just stop. There must be something that stops the motor, maybe it is magic. I got mine from Specialty Power Windows and they work great, bolted right up into the original screw holes for the window roll up hardware.
Senior User
Joined: Oct 2012
Posts: 218
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From: Kamloops, BC Canada
I had the same question when I did mine, wondered if I needed to add micro limit switches. I called the manufacturer, who said they were not required. Don't remember now what his explanation was, but it made sense to me at the time, and they work just fine too....
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Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
Clutch sounds reasonable although I wonder why the actuator doesn't chatter when the clutch engages...ala power drill clutch? The power window actuator that I am using has a longer travel than the height of the window glass. Assuming the clutch kicks in at the top, I am going to assume that I can place a stop on the track to keep the glass from dropping too far into the door and that the clutch will activate again on the downward path. I have a couple of spare window motors laying around here someplace, maybe I'll just take on apart and see what "magic" lies within.
New User
Joined: Feb 2017
Posts: 6
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From: Clovis
I believe its the same as some servo motors, once the motor has recieved a drop in movement it triggers off. Basically the window will roll up until closed all the way, then the motor will shut off. Its not a powerful motor and normally they have internal saftey switches.
Laughing Gas
Joined: Nov 2010
Posts: 859
Likes: 85
From: Queen Creek AZ
I'm curious which kit you used? I'm needing one for my '53 C500. Thanks, Ken.
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Elder User
Joined: Jun 2015
Posts: 791
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From: Louisville
Most just have an internal circuit breaker (self-resetting.) The motor is made to stall for quite a while without damage but if it begins to overheat the breaker will kick out. It's normally not an issue as most peeps will get bored with holding the button before the motor overheats. ;-)
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