Vehicles Equipped with Diesel Engines May Have Two Batteries Connected

Multiple Choice

Vehicles equipped with diesel engines may have two batteries connected in parallel in order to provide additional current at the same voltage. Technician A says to successfully test the batteries, they should be disconnected and tested separately. Technician B says that a fault in one battery has NO effect on the other battery. Who is right?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B