Fig. 102.

The resistance and leads and the controller cylinder are the only parts to be tested when the fuse blows on the 1st point.

CASE III.

Fuse Blows on 3rd or 4th point:

  1. Grounded resistance near R 4 or R 5.
  2. No. 1 motor grounded.

With either of the above defects the car will most probably refuse to move as the current is led to ground before passing through the motors.

Fig. 103. Plan of Car Shop.

No. 1 motor may be tested by cutting it out of service by means of its cut-out switch. If this removes the ground, the motor is at fault.

CASE IV.