hi more help needed please , just went in today to rebuild the internal door panels etc, just going to drop the window to refit felt pads on glass etc , but found neither of the windows operate. they have been working about two months ago, so wasnt expecting any problems. History wise , ive just fitted new turn indicator switch in the tilt/tele steering column and all works well. i have noticed that im not getting a red light on dash before start up, but the car still starts ok. ill check through today to see what else isnt working, but i have checked the fuse for the windows and that is fine, any help appreciated, the horn isnt working, but i think tats a seperate problem that i still need to identify. my immediate problem is the electric windows, thanks , brian, 

also just found the 20amp CTSY CLK fuse blown. 

see below link i found helpful

https://www.youtube.com/watch?v=PL4g6Bf8P5Y

There is a relay in the circuit. Not sure where it is but I think I installed it under the console near the switches when I put power windows in my '73.

thanks yes i agree . a relay under the console , what i cant understand , unless im reading the diagram wrong its not shown on that section, it shows a 30amp fuse, the the cabling to eacjh side power switch then to each side motor. But im wondering(ill check it in the morning, if the 25amp fuse which is blown for the Ctsy csk  has anything to do with it,  i update when i check it out, thanks very much for your reply, greatly appreciated, best regards. brian

The circuit diagram, besides being in the factory service manual, is also available in various Corvette aftermarket suppliers. 

this is one of the pages from the electrical service maual from a 1979 corvette c3

see below a youtube video link which i have found very helpful, relating to the 20amp fuse on the low voltage side of the relay, which insnt shown on the above diagram, hope this helps others thanks brian

https://www.youtube.com/watch?v=PL4g6Bf8P5Y

just found this on c3vr forum, talking about no relay on the 79 to 82 cars, does make a bit sense see below

https://www.c3vr.com/vrforums/power-window-relay-on-79_message349251.html

the diagram below shows the pink power window conductor plugged  in under the 35amp fuse, im going to check this in case i displaced this when pulling the new turn signal cables through the column when fitting the new turn signal switch. ill update once i find out, tanks again Brian

Thats interesting, just proof tested my tester , then checked the through the insulation on the pink cable coming out of the fuseboard for the power window supply, and NO POWER on the cable at all. 

i will check this out further, ive just checked the 35amp fuse 5 mins earlier and that was fine, so its either the pink wire not plugged in correctly or a problem with the fuse board. I will update after further investigation. thanks all brian. 

just tried to pull out disconnect the pink wire at the fuseboard, for the power windows, but no joy "stuck solid"( possibly welded itself in position, should just pull pull out , im assuming, im going to try and take a close up photo shortly and put it on the discussion.

photo added below , not sure what type of connector this is as i cant seem to pull it out freely, any help appreciated, thanks

Sometimes these type of push-in connectors have a small tab on one side that springs up once the connector is inserted and prevents it from being removed. Usually a thin bladed screwdriver or other thin object can reach in and depress the tab and allow removal of the connector. 

thanks , ill check that in the morning, thanks again for your help, regards, brian

Can you go on the other side of the firewall and see if that position on the connector has power? 

Very nice diagram of inside fuse block. Wish I had had that when doing my rewire under dash. Did a total rewire of car. No real problems, save eliminating the theft system. 

thanks, never thought of checking at that side, wasnt familiar with access on that side thanks for that . Ill check that out tomorrow am, regards, brian