The capacitors go from each brush to ground. One capacitor goes from one brush to ground. The other capacitor goes from the other brush to ground. Did you check the capacitors to see if one is shorted? You can wire everything up without the capacitors and see if it runs, but don't run it that way for more than a second or two. The capacitors are there for spike suppression and spikes will get into things and make then act funny.
Check all of your wires, one at a time. The instruction manual is on the ERR website and it should include a wiring diagram.
It looks like you have both ends of the field grounded. Only one end of the field gets grounded.