Kevin, if you remove the limiter switch cover, you can peek inside to see if the brushes are still attached. Does the motor run at all? Have you replaced th relay mounted on the side of the headlight assembly? Is the single wire harness securely plugged together?
As GTRS said, you can get a Gen 2 front wiring harness and motors along with the solid state control module from another 87 or 88 Fiero. The solid state modules are more dependable, but like the Gen 1 isolatio module, is no longer made. To purchase one from The Fiero Store is close to $700. USED.
Gen 2 motors are available from auto parts stores for less than $100 each, but won't work with the Gen 1 system.