Pwr Window/Dome light won't work ??

[45acp]

Hi.Sure appriciate any ideas on this one. I have a 99 ranger supercab 4 door. It has developed a strange and really annoying problem. The power windows and the dome light stop working ( at the same time). This happens randomly, at any given time, sitting still, moving, running or not and then they start working again. I have shaken& banged on everything ( and checked the fuses)and cannot find anything that triggers it. I do not have a wiring diagram so I cannot chase down a "common denominator" for the dome light/power windows. WHen it first started it seemed to have some relation to the rear drivers side door, but I don't get a change from opening/closing that now. WHen the problem occurs nether the drivers or passenger side window switches get any response ( no noise,etc.)and the dome light is dead whether using the manual switch or for an open door. Whether the door is open or closed makes no difference.

THis is kind of an unusual truck in that it only has 35k miles on it (1999 model)

Thanks for any help!