I had the same problem on my 78 T/A, and to perform a little troubleshooting I used a meter to find which wire was hot at the switch. If there is no power on any wire then you need to keep looking for power. Once you have power then use a jumper from this hot to any of the other 4 wires -- tow wires go to each window. One os for up and the other is for down. Only hot is supplied to the motor -- it needs a grond path to work and usually the door frame/hinges supplies the return path. After all my troubleshooting, i finally cleaned the connectors on the pigtail at the windoe motors. The connectors can be disassembled for cleaning by using a very thin screwdrive (very thin) and releasing the "tang" while you pull the wire out of the connector. Be carful because the tang is very sharp and will cut when it comes out of the connector -- ask how I know. Anyways after cleaning the connectors the windoes worked OK but still slow. The next thing was to replace the power window switch. Not cheap but the windows sure work a lot better. Also, the pink wire is hot (in the 78 T/A). Also, as far as a relay goes, some models did come with a relay -- but think about it -- you would need several relays to perform both windows up or down so one relay cannot perform all the tasks. If you do find you have relays expect to find more than one to control both windows. Hope this helps.
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