Lesson 3/Learning Event 1
Remember, the ohmmeter is actually an ammeter and is always connected in series with a circuit.
ALWAYS disconnect the vehicle battery or batteries from the circuit BEFORE connecting the
ohmmeter to the circuit. You will use the ohmmeter to measure resistance, locate open circuits
(broken wires), and shorts (touching wires). You can also check the operation of switches and
locate grounds in a circuit.
The ohmmeter is a valuable test meter--take care of it!
So far, you have learned about the voltmeter, ammeter, and ohmmeter as separate test meters or
instruments. It is more practical to combine these meters into one unit. You will be using two
combined instruments: the low-voltage circuit tester and the multimeter.