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Hi Hugh,
Check out this link for a new switch:
https://www.ebay.com/itm/NEW-Volvo-Window-Switch-Front-1347045-240-244-245-740-745-760-850-940-960/122645078556?epid=189055722&hash=item1c8e37621c:g:iuMAAOSwtjxZk1a3&vxp=mtr
Ebay has complete used switch modules for about $30 shipped.
Old switches and relays are good for temporary repair since they have unknown
mileage/wear.
There is something else about the windows, do you raise and lower two or more at a time, and/or run the windows with the engine off?
If so there will be some extra voltage drop, which may increase the current flow through the switches. Do you hear the windows groaning and struggling when going up? The motors run better with 14VDC than 12.6
Maybe there's a bind in the window, raising the current flow? There's a guide track for the rear edge of the drivers window that's famous for breaking loose.
Make sure that the drivers window goes all the way up.
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