No, all he needs to do is wire a normally-closed microswitch in series
with the down switch. When the window hits the microswitch, it will
open
and unground the motor wire, just like releasing the console switch
does.
And, as has already been stated, permanently lock the window
in the down position. The motor only has two wires, just like
a light bulb. If you disconnect one wire to a light bulb, will
it light up again when you switch polarity to the other wire?
No, it will not.
How about wood blocks in the bottoms of the doors.
That will still have the problem of motor torque twisting things.
My recollection is that the down stop should be a separate stop
against the arm, and that's often out of place. It should not be
putting side force on the slider.
The ONLY problem with the design is that the casting is a bit
too flimsy for the material it is made out of. It warps with
time, and usually cracks when you try to bend it back. The
motor is stall current limited, it doesn't need any more complexity.
It's pretty reliable as-is. The switches get dirty, or the castings
break. Those are the big problems.
-- Jim
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