I have a BOSCH 4000 table saw which spins very slow. I opened the motor took out the field to examine. When I tried to reassemble it, I faced some problem. There are two wires from field, one connects to the Brush Holder. I am not sure where the second one goes. To the second brush holder or to be connected to Control Board?

There is 4 wires from the field, 2 reds a white and a black. the reds have spade connectors on them, they go to the brush holders. The white goes to the white on the speed controler and the black goes to the black on the speed controller. There is one wire from the speed control that goes on to one of the brush leads, there is a small adapter that allows both wires to be connected. If the motor spins very slow then the field is faulty and needs replaced.

Hope this helps

Weakness of this saw is sawdust and debri entering the cooling ports of the motor causing intermittent contact of brushes which damages the motor speed control board ($40.00). Don't ever operate this saw with out a vacuum saw dust extraction system. Also when you replace the Speed control board also replace the Brushes ($6.00).
You can bypass the speed control board (if you want to disable this wonderful engineering feature by attaching black and white power wires directly to the black and white wires to motor.
Blow motor out regularly with compressed air !!