Hello all. I am very new to all of this, so please bear with me. Our 70 XR7 unfortunately does not a have a single power window that works. I've ordered some wiring diagrams, that should arrive next week to help me get started. I suspect, however, that since all 4 are inoperative that it is a problem with the main switch on the driver side door. If this switch is bad/bad contacts does it render the individual switches on each door inoperable? Thanks for any help you might offer.