ELECTRICAL

ELECTRICAL

Figure 6.

Figure 4.

Six electronic check valves called diodes are located in

the end frame assembly nearest the slip rings. Three of

these diodes are negative and are mounted directly to

the end frame.

Three positive diodes are mounted into a strip called a

"heat sink", which is insulated from the end frame.

These six diodes change the alternating current

developed by the alternator into direct current to charge

the battery and power the accessories. (Fig. 7)

Figure 5.

Two slip rings upon which the brushes ride, are mounted

on one end of the rotor shaft and are attached to the

leads from the field coil. (Fig. 6) When the ignition

switch is first closed, current from the battery passes

through one brush, through the slip ring upon which the

brush rides, and then through the field coil. After

leaving the field coil, current flow continues through the

other slip ring and brush before returning to the battery

through the ground return path. This flow of electrical

energy through the field winding is called field current.

Figure 7.

B-58

ELECTRICAL