Final answer:
Both Technician A and Technician B are correct; wiring splices are usually indicated by a dot on automotive diagrams, and a capital 'G' can represent a ground connection.
Step-by-step explanation:
The student's question asks who is correct regarding the representation of wiring splices and grounds in automotive wiring diagrams. Technician A states that wiring splices are designated by a dot, while Technician B says that a capital "G" can be used to designate ground. Both Technician A and Technician B are correct in this context. In automotive wiring diagrams, wiring splices are indeed often indicated by a dot where the wires join. Ground connections can be represented by a variety of symbols, including but not limited to a capital "G". It's important to consult the legend or symbol chart of a specific wiring diagram, as symbols can vary between manufacturers and diagrams.