CKT 30 (WHT/RED) from the 25 Amp circuit breaker in the IP fuse block provides battery voltage at the ignition switch at all times. CKT 2 (RED) from the fusible link on the starter provides battery voltage to the starter relay contacts at all times.
When you turn the ignition to the START position, the contacts close in order to apply voltage on CKT 5 (YEL) to the neutral switch (automatic transmission). If the automatic transmission is in the NEUTRAL position, voltage applies to CKT 434 (ORN/BLK) to the starter relay coil. CKT 150 (BLK) grounds the starter relay coil at ground G107.
When voltage applies to the coil, the starter relay energizes. CKT 6 (PPL) then applies voltage to the starter solenoid winding terminal S. CKT 1 (BLK) at starter solenoid terminal B also provides battery voltage at all times.
When battery voltage applies at starter solenoid terminal S, current flows through the hold-in winding to the mechanical ground at the solenoid. Simultaneously, current flows through the pull-in winding and the starter motor to the starter motor's mechanical ground. The combined force of these windings overcomes the force of the return spring. This force pulls the starter's plunger in order to engage the starter with the flywheel drive assembly through the shift lever. The engine turns over. The actuation of the plunger also operates a contact in the starter solenoid. This contact closes in order to apply battery voltage directly to the starter motor. With battery voltage applied directly to the starter motor, the pull-in winding no longer has a voltage drop across the coil. Current ceases to flow. The current flow through the hold-in winding enables the starter solenoid to remain engaged.
The starter motor operates until the ignition switch returns to the RUN position. With the ignition switch in the RUN position, voltage exits through starter solenoid terminal S. However, voltage remains at terminal B. CKT 1 (BLK) energizes both the hold-in winding and the pull-in winding. The forces from these windings now oppose one another. The operation of the return spring returns the plunger to the disengaged position. This action operates the contact in order to remove battery voltage from the starter motor. This action stops the motor. Both windings also de-energize. This plunger operation also retracts the starter from the flywheel drive assembly. The engine operates on the engine's own power.