Detail of rear of aux generator field rheostat. The three to the left are the coarse adjustment, the smaller to the right is the vernier.
Taking photographs up into the aft distribution panel. The lower cables go to K switches. The stacked structure above this is the aux generator field rheostat. The taped off cables are visible behind it in this photograph -- barely.
More investigation atop the reduction drive, which was not completely covered in pointy bolts...