Anna'sDad's schematic was great help figuring out my 03 aftermarket windshield kit wiring. There was no juice coming from the switch to the Down relay.MidLife, what blrfl said.
Check this thread in particular post 2.
https://www.st-owners.com/forums/showthread.php?109334-Windshield-motor-cross-wired
Turns out that last time my friendly neighborhood dealer installed the left fairing back, they never did bother to place the big harness connector back in the special bracket it belongs to on the inside of the fairing. A connection on the wire going to the down limit switch was pinched between the large unsecured harness connector and the frame and had worked itself loose, which also explains why the problem was intermittent.
Thanks a lot for the help.