Final answer:
Both Technician A and Technician B are correct. A load tester measures the condition of a vehicle's battery by applying a load and observing if the terminal voltage drops below acceptable levels. The same principle applies to testing the vehicle's starting system with a load tester.
Step-by-step explanation:
Technician A says a load tester can be used to check the condition of a vehicle's battery. Technician B says a load tester can be used to check the condition of the vehicle's starting system. Who is right? The correct answer is C) Both. A load tester is indeed used to measure the terminal voltage under a load to help determine the condition of a battery. It applies a significant load to the battery, mimicking the conditions under which the battery would be used during vehicle starting. This process can reveal if the terminal voltage drops below an acceptable level, which indicates that the internal resistance is high, and thus the battery is weak. Similarly, the vehicle's starting system can also be tested with a load tester, as the starting system's ability to operate under load (draw current without significant voltage drop) is a critical determinant of its health. Therefore, both technicians are correct in their statements.