A friend just bought what he calls a project car, a 97 BMW 328iC. It has convertible top issues, as in won't go up/down without help and asked me to help dig up some info for it. I thought of asking here first. Looking for wiring schematics and/or manuals online if possible. Ideas on what could be wrong wouldn't hurt either. 
He thinks it's probably electrical but will check the motors this weekend.
I don't know that much about convertible top motors, the only droptops I have ever owned is my Miata and early MG Midget that has the assemble on the car with side curtains type top.
Any help/ideas would be appreciated.
