The circuit breaker on the starter relay is the only thing I can see that the windows and locks have in common outside of some wiring. Do you have a B/W wire connected directly to the starter relay? Maybe someone just bypassed the breaker.
You should have a Power Window Safety relay inside the kick panel, but that isn't connected to the locks in any way. The PWS relay is normally fed from the breaker on the starter relay.
Also see if you have a grey, 3 pin connector inside the kick panel with a B/W wire. Maybe a pin backed out.
That's why I mentioned that someone might have bypassed the circuit breaker and gotten rid of it altogether. It wouldn't be difficult to do except that the breaker is the only thing that provides protection to the door lock circuit.
The verts use both the circuit breaker (position 14) in the fuse box and the in-line circuit breaker on the starter solenoid. Normally the breaker in the fuse box gets power from the ignition switch when it goes to ACC or RUN and the breaker on the starter relay is always hot. When you turn the key the Power Window Safety relay is activated and power from the in-line breaker flows through the contacts of the PWS relay to the window switch.
88-89 Convertible Power Window Circuit
Driver's side motor probably not.
Driver's side switch is possible especially if it affected the grounding circuit. Wiring to the window switch sockets could also be a factor.
It would be a good idea to take a meter to the in/out voltages to isolate affected components.
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