Which of the following is the first step you should take once you have obtained a wiring diagram for the circuit you are studying? Which of the following is the first step you should take once you have obtained a wiring diagram for the circuit you are studying? Determine where the battery is Locate the component that is not working and identify how many volts each of its wires should have Locate the fuses and relays for the circuit Take note of all of the wire colors and locate those wires on the vehicle