G'day. I had the same problem and I used aerosol silicone spray on the tracks. You have to be a bit careful with the stufff as it migrates freely over surfaces (like glass). However, applied carefully in the tracks using the extended nozzle on the can (including shooting the stuff down into the tracks in the door) I got my windows into overdrive! It's doubtful it's electrical - all they are doing is struggling a bit against the friction of the glass in the guides. I think I used Nulon spray silicon.
yeah i heard silicone spray too.
i have an AU and my passenger side is really slow but it's the dust from where i work getting into it. A mechanic told me Ford have quite a bad design for power windows even in the new cars. The spray ought to fix it though!
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