ASR, ABS, Roll Bar Warning lights

This morning when my wife started to work in our 95 SL-320, the ASR, ABS, roll bar warning lights each came on solid. The roll bar still moves but the top will not go down. I have heard the overvoltage relay or the fuse next to it could be the cause but I don't know where it is. The owners manual states that the ABS indicator will come on if the charging voltage falls below 10 volts. This then defeats the ASR system. The battery appears fine and I measured charge voltage while running.

Any ideas would be greatly appreciated. Also any suggestions for obtaining decent service manuals and schematics.

Thanks in advance, Mike