What is it that breaks on these ? The window will go up and stay up by lifting by hand but the motor just makes a click noise like the window is allready up. I mean what part of the regulator ?

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.