Final answer:
Technician A is correct about the starter control circuit consisting of the mentioned components, and Technician B is correct that the main circuit shares only the starter solenoid with the control circuit, but they operate on different sides.
Step-by-step explanation:
Both Technician A and Technician B are correct. The starter control circuit indeed consists of switches, a relay, a fuse, and the coil side of the starter solenoid. This circuit is responsible for controlling the flow of electricity to the starter system. When a switch is closed, it allows current to pass through without a loss of voltage. A typical switch in a vehicle is similar to a light switch, serving to open or close the electrical circuit. Relays are used to control a higher power circuit with a lower power signal, often found in starter circuits to enable the connection to the high-current starter motor.
The main circuit, which Technician B refers to, involves the parts of the circuit where high current travels to actually turn the starter motor. This circuit includes the starter solenoid (on the contact side, not the coil side), the motor itself, and typically includes a large battery cable connected directly to the battery. The only common component both circuits share is the starter solenoid, but each utilizes different parts of it.
Furthermore, the starter circuit's safety and control aspects are often handled by circuit protection devices such as fuses, which break the connection when the current is too high, or are represented by schematic symbols in diagrams. These protections are crucial for preventing damage to the electrical system.