The ohmmeter is connected to two terminals of the consumer or to two ends of the electric wire. It does not matter which wire of the ohmmeter (+) or (-) is connected to one or another contact.
Resistance measurement in the automotive industry is limited mainly to two areas:
- a) checking the resistance or any other part included in the electrical circuit;
- b) "ringing" of an electric wire, switch, sensor, or heating element coil. This checks whether any wire is broken and whether this is the cause of failure of the device connected to it. To measure, an ohmmeter is connected to both ends of the wire being checked. If the resistance is 0 Ohm, the wire is OK. If the wire is broken, the device shows ∞ Ohm (infinite resistance).