Yeah, this one is kind of crazy, and as I mentioned in my posts, the headlight wiper theory was my best guess.
Try this - with the key on, headlights on, wiper switch off (and wipers going, of course) pull the fuses for the headlights, one at a time, first the left, then the right. Which ever removal causes the wipers to stop, check the wiring on that side.
The only other place where I can see the wires getting close enough to cause this problem is in the fuse and relay tray area.
Another suspect area is the combo switch/stalk on the steering column - the wiper control is on the other side.
I have a pdf chart for the 89 740 - the wiring should be similar - if you need it, let me know and I'll e-mail it to you.
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